Tandberg Data SDLT220 Product Manual Download

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CHAPTER 6

SCSI Description

This chapter covers the following topics:

•

“SCSI Overview”

introduces the SCSI specification.

•

“SCSI-2 Commands”

lists the SCSI-2 commands implemented by

SDLT 220/320.

•

“SCSI-3 Commands”

lists the SCSI-3 commands implemented by

SDLT 220/320.

•

“Parity”

defines the meaning of data parity checking.

•

“Signal States”

defines the meaning of SCSI signal values and SCSI IDs.

•

“SCSI Signals”

defines SCSI signals and provides bus timing values.

6.1

SCSI Overview

The Small Computer System Interface (SCSI) is a specification for a peripheral
bus and command set that is an ANSI standard. The standard defines an I/O wide
SCSI bus that supports up to 16 devices (15 SCSI devices and one host adapter).

ANSI defines three primary objectives for SCSI-2:

To provide host computers with device-independence within a class of
devices.

To be backward-compatible with SCSI-1 devices that support bus parity and
that meet conformance level 2 of SCSI-1.

To move device-dependent intelligence to the SCSI-2 devices.

Summary of Contents for SDLT220

Page 1: ...TANDBERG Super DLTTM Product manual Revision 2 June 2002 432589 01 ...

Page 2: ...tive works The possessor agrees to safeguard this information and to maintain it in confidence and not re publish it in whole or in part without Tandberg s prior written consent Tandberg Data reserves the right to make changes and improvements to its products without incurring any obligation to incorporate such changes or improvements in units previously sold or shipped It is the responsibility of...

Page 3: ...SDLT 220 and SDLT 320 Product Manual Revision History Revision Date YYMMDD Summary of Changes 422216 01 020610 Initial Release ...

Page 4: ...a cables or the need for special devices such as ferrite beads on cables is required if such means of interference suppression was used in the qualification test for the device This information will vary from device to device and needs to be obtained from the EMC Electromagnetic Compatibility group or product manager Warning This is a Class A product In a domestic environment this product may caus...

Page 5: ...and used in accordance with the instructions may cause harmful interference to radio communications However there is no guarantee that interference will not occur in a particular installation If this equipment does cause harmful interference to radio or television reception which can be determined by turning the equipment off and on the user is encouraged to try to correct the interference by one ...

Page 6: ...ce to device and needs to be obtained from the EMC Electromagnetic Compatibility group or product manager This Class B digital apparatus complies with Canadian ICES 003 Cet appareil numérique de la classe B est conforme à la norme NMB 003 du Canada ...

Page 7: ...Features 2 2 SDLT 220 320 Technology 2 3 Laser Guided Magnetic Recording 2 3 Pivoting Optical Servo 2 4 Magneto Resistive Cluster Heads 2 4 Advanced Partial Response Maximum Likelihood 2 5 Advanced Metal Powder Media 2 5 Positive Engagement 2 5 SDLT 220 320 Modular Design 2 6 Data Control Module 2 7 Tape Control Module 2 8 TCM PCBA 2 8 Base Plate 2 8 Cartridge Receiver 2 8 Positive Engagement Tape...

Page 8: ...8 Current and Power Requirements 3 10 Tape System Recording Method 3 12 Environmental Specifications 3 13 Air Flow Requirements 3 13 Temperature and Humidity 3 14 Storage and Shipment 3 14 Altitude 3 15 Particulate Contamination Limits 3 15 Recording Media Specifications 3 15 Backward Read Compatibility Transfer Rates 3 17 CHAPTER 4 Installing Your Tape Drive 4 1 Safety Handling and ESD Protection...

Page 9: ...ng the Firmware 5 4 Update the Firmware Using the SCSI Bus 5 4 Making a FUP CUP Tape 5 5 Using a CUP FUP Tape 5 5 Troubleshooting the Firmware Code Update 5 6 Cleaning the Tape Mechanism 5 7 Occasional Cleaning of Tape Head 5 7 When to Use the Cleaning Tape 5 8 Life Expectancy of the Cleaning Tape 5 8 Compatibility of the Cleaning Tape 5 8 Loading the Cleaning Tape Into a Tabletop Drive 5 9 Front ...

Page 10: ...eptibility and ESD Limits 7 5 Acoustic Noise Emissions 7 6 APPENDIX A SDLT I Tape Cartridge A 1 Tape Cartridge Handling Guidelines A 2 Tape Cartridge Inspection Procedure A 3 Tape Cartridge Write Protect Switch A 5 Loading a Tape Cartridge A 7 Unloading a Tape Cartridge A 8 Overwriting 320 Formatted SDLT Tape Cartridges A 8 APPENDIX B DLT IV Tape Cartridge B 1 Tape Cartridge Handling Guidelines B ...

Page 11: ...Table 3 6 SDLT 220 320 Performance Data 3 7 Table 3 7 Non Operating Shock Specifications Unpackaged 3 8 Table 3 8 Non Operating Shock Specifications Packaged Drop 3 8 Table 3 9 Non Operating Vibration Specifications 3 9 Table 3 10 Operating Shock and Vibration Specifications 3 10 Table 3 11 Current and Power Specifications 3 11 Table 3 12 Temperature and Humidity Specification 3 14 Table 3 13 Driv...

Page 12: ...ED Control Functionality 5 12 Table 5 4 Troubleshooting Chart 5 13 CHAPTER 6 SCSI Description 6 1 Table 6 1 Implemented ANSI SCSI 2 Commands 6 3 Table 6 2 Implemented ANSI SCSI 3 Commands 6 5 Table 6 3 ANSI Signal Sources 6 7 Table 6 4 SCSI 2 Bus Signal Definitions 6 9 Table 6 5 SCSI Bus Timing Values 6 10 CHAPTER 7 Regulatory Compliance 7 1 Table 7 1 EMI Regulations and Certifications 7 3 Table 7...

Page 13: ...ors on the Back Panel 4 8 Figure 4 2 Back Panel Connector Locations Drawn to Scale 4 8 Figure 4 3 TERMPWR Connector 4 10 Figure 4 4 SDLT 220 320 Two Views Front Side Top and Back Side Top 4 11 Figure 4 5 Internal Drive Mounting Locations Side and Bottom Views 4 12 Figure 4 6 Connectors on the Back Panel Drawn to Scale 4 14 Figure 4 7 Back Panel of the Tabletop Model 4 20 Figure 4 8 AC Power Cord C...

Page 14: ... Switch on Tape Cartridge A 5 Figure A 4 Front Panel LEDs A 7 APPENDIX B DLT IV Tape Cartridge B 1 Figure B 1 End View of DLT Cartridge B 4 Figure B 2 Bottom View of DLT Cartridge B 4 Figure B 3 DLT Tape Leader Loop in its Correct Position B 5 Figure B 4 Tape Cartridges with Damage Visible During Visual Inspection B 6 Figure B 5 Write Protect Switch on Tape Cartridge B 7 Figure B 6 Front Panel LED...

Page 15: ...easy to use comprehensive information source and product catalog to familiarize both the Tandberg Data customer base and systems professional with the SDLT 220 and SDLT 320 cartridge tape systems subsequently referred to in this document as SDLT 220 320 The SDLT 220 and SDLT 320 models have many characteristics in common enabling both sets of information to be presented in a single document NOTE E...

Page 16: ...ter 3 Drive Specifications lists various specifications for the tape system product functional environmental and recording media Chapter 4 Installing Your Tape Drive contains handling and pre installation guidelines configuration advice plus mounting and installation information for your SDLT tape drive Chapter 5 Using Your Tape Drive contains information on running the self test descriptions of t...

Page 17: ...including handling and inspection procedures information on the write protect switch and how to load and unload a tape cartridge Appendix B DLT IV Cartridge includes the cartridge insertion and ejection guidelines Glossary provides definitions for technical terms and acronyms that are used throughout the document ...

Page 18: ...ted information visit http www tandberg com Table 1 1 Typographical Conventions Element Convention Example Commands Uppercase unless case sensitive FORMAT UNIT Messages Uppercase INVALID PRODUCT NUMBER Hexadecimal Notation Number followed by lowercase h 25h Binary Notation Number followed by lowercase b 101b Decimal Notation Number without suffix 512 Acronyms Uppercase POST Abbreviations Lowercase...

Page 19: ...er Comments Tandberg Data is committed to providing the best products and service We encourage your comments suggestions and corrections for this manual Please send all comments to Tandberg Data ASA P O Box 134 Kjelsas N 0411 Norway ...

Page 20: ...CHAPTER 1 Introduction ...

Page 21: ... in the SDLT 220 and 320 products Tandberg Diagnostics Tools describes tools and utilities that provide the ability to run diagnostics and test for drive functionality TapeAlert describes a built in tape device status monitoring and messaging utility 2 1 Overview The Tandberg Super DLTtape SDLT System is a highly scalable tape drive designed for multiple product generations It is a follow on to th...

Page 22: ...stem and tape library solutions The SDLT architecture builds on the DLT legacy by offering backward compatibility data backed up today using the DLT 8000 DLT 7000 DLT 4000 and DLT 1 VS80 systems will be retrievable in the future using SDLT based systems with DLT IV type media Global Storage Link GS Link An infrared wireless interface that provides a wireless remote testing base allowing customers ...

Page 23: ...ptically on the backside LGMR optimizes highly proven technologies to deliver the most efficient reliable and scalable data backup solution to the mid range market 2 3 1 Laser Guided Magnetic Recording 2 3 SDLT 220 320 Technology Figure 2 1 SDLT 220 320 Drive System Photographs Internal drive External drive SDLT incorporates various new state of the art technologies that contribute to the SDLT arc...

Page 24: ...ead to track dynamic variations in tape motion which provides a track count with an order of magnitude increase over current DLT products 2 3 3 Magneto Resistive Cluster Heads Magneto Resistive Cluster MRC heads are a densely packed array of small cost effective Magneto Resistive MR tape heads precisely positioned using advanced thin film processing technology SDLT MRC heads provide high wafer usa...

Page 25: ...he back side of the media the entire data bearing side of the media is available for recording data and eliminate the need for pre formatting In addition AMP media has been designed to meet the needs of multiple generations of the SDLT technology 2 3 6 Positive Engagement Positive engagement is a highly robust tape leader buckling mechanism that increases cartridge life and supports the heavy duty...

Page 26: ... Module FPM Electronic Interface Module EIM SDLT Cartridge Tape Module CTM The modular concept makes the SDLT system easy to manufacture and configure Each module is optimized to perform a specific set of functions and designed to interface with the other modules in a well defined and flexible manner The following subsections provide a brief overview of each module Figure 2 3 SDLT 220 320 Modular ...

Page 27: ...POS and MRC heads described in Section 2 3 2 Pivoting Optical Servo on page 2 4 and Section 2 3 3 Magneto Resistive Cluster Heads on page 2 4 the DCM contains a number of components that interact to perform these functions These components include the advanced head guide assembly take up reel drive motor the optical servo system and the tape heads The SDLT path from the first tape guide through th...

Page 28: ...tured and tested as a stand alone module simplifying the design manufacturing and troubleshooting processes Base Plate The SDLT base plate is an aluminum die casting with precisely machined surfaces that acts as the support platform for the other modules and for the drive enclosure The base plate also includes the precision mounting holes used to install SDLT drives into a server or tape library T...

Page 29: ...idge load and disengaging them on cartridge unload The SDLT buckling mechanism has been designed to work with the new leaders of the SDLT design as well as the leaders of the previous DLT design allowing backward read compatibility BRC of DLT IV cartridges in the SDLT system 2 4 3 Front Panel Module The Front Panel Module FPM of the system sometimes referred to as the bezel performs a number of fu...

Page 30: ...tinct module 2 4 5 SDLT Cartridge Tape Module As with all tape technologies the SDLT cartridge is a key part of the overall system The main function of the Cartridge Tape Module CTM is to provide the magnetic recording media used by the system to store customer information The CTM also provides the protective cartridge that allows the media to be removed and stored safely From the outside the SDLT...

Page 31: ...DLT Tape 1 DLT Tape IV Read Only DLT 1 VS80 TRS13 Model Read Only SDLT Tape 1 DLT Tape IV Read Only DLT 1 VS80 Read Only The compression rates shown assume an industry standard 2 1 compression ratio Actual compression ratios achieved depend on the redundancy of data files being recorded Reliability MTBF Media Durability Warranty 250 000 Power On Hrs 1 000 000 passes 3 years 250 000 Power On Hrs 1 ...

Page 32: ...lows you to load tape drive firmware and create code upload tapes GSLink Allows you to quickly diagnose the integrity of the drive using an infrared wireless communication connector located on the front panel of the tape drive Pocket GSLink Allows you to diagnose the integrity of a Super DLTtape drive using your Pocket PC This application uses infrared wireless communication between your Pocket PC...

Page 33: ...application will automatically read the device s TapeAlert SCSI log page to check for any problems If an error is flagged your backup software displays a clear warning message on your screen and adds the TapeAlert messages to its logs These messages are standard across all applications that support TapeAlert and are designed to give clear explanation of the problem and suggested resolution For exa...

Page 34: ...CHAPTER 2 SDLT 220 320 Product Information ...

Page 35: ...unctional Specifications provides the functional specifications for the SDLT 220 320 tape drives Environmental Specifications provides the environmental specifications for the SDLT 220 320 tape drives Recording Media Specifications provides the media specifications for SDLT I and DLT IV tape cartridges 3 1 Product Specifications The following subsections contain full product specifications for the...

Page 36: ... page 4 10 3 1 2 Physical Dimensions Table 3 1 provides physical dimensions for the SDLT system Table 3 1 SDLT 220 320 Physical Dimensions and Shipping Weight Description Internal Version Tabletop Version Height 82 55 mm 3 25 in without front bezel 86 36 mm 3 40 in with front bezel 160 02 mm 6 30 in Width 146 05 mm 5 75 in behind front bezel 148 34 mm 5 84 in with front bezel 175 26 mm 6 9 in Dept...

Page 37: ...l compression ratios achieved depend on the redundancy and type of data files being written 3 1 4 Compression The drive contains on board hardware to compress and decompress data using a DLZ algorithm The default setting for data compression is ON Table 3 2 SDLT 220 320 Storage Capacity SDLT 220 SDLT 320 Native Storage Capacity 110 GB 160 GB Compressed Storage Capacity 220 GB 2 1 compression ratio...

Page 38: ...ntegrity for the overall tape system is shown in Table 3 3 Table 3 3 Data Transfer Error Rates Error Type Frequency Error Rates Recoverable READ 1 error in 106 bytes read Detected Unrecoverable READ 1 error in 1017 bits read Undetected READ 1 error in 1027 bits read Rewrite errors 5 per 106 bytes written ...

Page 39: ...SDLT 320 Burst Max Configu ration Native Com pressed Native Com pressed HVD Ultra 1 SCSI Narrow 11 MB sec 20 MB sec 20 MB sec 16 MB sec 20 MB sec 20 MB sec Wide 11 MB sec 22 MB sec 40 MB sec 16 MB sec 32 MB sec 40 MB sec LVD Ultra 2 SCSI Narrow 11 MB sec 22 MB sec 40 MB sec 16 MB sec 32 MB sec 40 MB sec Wide 11 MB sec 22 MB sec 80 MB sec 16 MB sec 32 MB sec 80 MB sec Burst speeds are limited by th...

Page 40: ...ual figures vary from unit to unit 3 1 8 Load and Unload Cycles Load and unload cycles are rated at 15 000 for the cartridge itself Table 3 5 shows the number of load and unload cycles and tape insertions an SDLT drive can perform before it needs to be replaced 3 2 Functional Specifications The following subsections contain full functional specifications for the Tandberg SDLT 220 320 tape drives T...

Page 41: ...ity 133 Kbits per inch bpi 193 Kbits per inch bpi Read Write Tape Speed 116 inches per second ips 122 inches per second ips Rewind Tape Speed 160 ips Same Linear Search Tape Speed 160 ips Same Average Rewind Time 69 seconds Same Maximum Rewind Time 140 seconds Same Average Access Time from BOT 70 seconds Same Maximum Access Time from BOT 142 seconds Same Load to BOT 12 seconds typical 40 seconds u...

Page 42: ...Unpackaged Shock Unpackaged Pulse Shape Square wave sine pulse Peak Acceleration 40 G 140 G Duration 10 ms 180 inches second 2 ms Application X Y Z axes twice in each axis once in each direction Table 3 8 Non Operating Shock Specifications Packaged Drop Shock Packaged Drop Height of Drop Number of Drops Package Weight Drop 42 inches 36 inches 16 drops total 16 drops total 0 lbs package weight 20 l...

Page 43: ...008 G2 Hz Application X Y Z axes Sweep rate 60 minutes axis Vibration Packaged Type Random Frequency Range Truck Profile 0 5 Grms Air Profile 1 0 Grms Application X Y Z axes 30 minutes each profile and each axis for a total of 3 hours Type Sine Sweep and Dwell Frequency Range 5 150 5 Hz 0 5 octave minute 0 5 G Application X Y Z axes dwell at lowest resonant frequency in axis for 30 minutes Additio...

Page 44: ...e two modes is similar enough that they are listed together Power up current surges are less than those encountered during motor accelerations and so are not listed separately NOTE In Table 3 11 the current and DC power values are relevant to the internal drive while the AC power values are relevant to the tabletop drive Table 3 10 Operating Shock and Vibration Specifications Shock Pulse Shape sin...

Page 45: ...ring this operating mode These values are calculated from the average of RMS current 3 sigma measured at nominal DC voltage 3 The typical current is calculated from the average of all RMS current drawn during this operating mode measured at nominal DC voltage 4 The Max DC power is calculated from the typical DC power 3 sigma measured at nominal DC voltage This value takes into account that the pea...

Page 46: ...Recording Method The SDLT 220 tape system uses the Partial Response Maximum Likelihood PRML 32 33 encoding method for reading writing SDLT format The SDLT 320 tape system uses the PRML 32 33 encoding method for reading writing SDLT 320 and 220 format ...

Page 47: ... drives be used in a clean smoke free environment 3 3 1 Air Flow Requirements Adequate air flow must be provided for the internal tape drive to dissipate the heat resulting from continuous drive operation Specifically the air flow must be sufficient to keep the tape path temperature below 52 C NOTE It is important to realize that the amount of air flow provided for the tape drive determines the ma...

Page 48: ...emperature 25 C 77 F 25 C 77 F Dry Bulb Temperature Range 10 C to 40 C 50 F to 104 F 10 C to 40 C 50 F to 104 F Temperature Gradient 11 C 20 F hour across range 15 C 27 F hour across range Relative Humidity 20 to 80 non condensing 10 to 90 non condensing Humidity Gradient 10 hour 10 hour Table 3 13 Drive Storage and Shipment Specifications Specification Storage Unpacked or Packed Shipping Wet Bulb...

Page 49: ...nment for the tape drive may not exceed the particulate counts shown in Table 3 14 3 4 Recording Media Specifications The following tables provide specifications for SDLT I media Basic media specifications for the SDLT I are shown in Table 3 15 Operating storage and shipping environment limits for the DLTtape IV cartridges are shown in Table 3 16 Table 3 14 Particulate Contamination Limits Particl...

Page 50: ...fice computer environment Cartridge Housing Color Dark Green Table 3 16 DLTtape Media Operating and Storage Limits Operating Conditions Temperature 10 to 40 C 50 to 104 F Relative Humidity 20 to 80 non condensing Storage Conditions With Data Without Data Temperature 18 to 28 C 64 to 82 F 16 to 32 C 66 to 89 F Relative Humidity 40 to 60 non condensing 20 to 80 non condensing Shipping Conditions Tem...

Page 51: ...ted in Table 3 17 Table 3 17 Backward Read Compatibility BRC Transfer Rates Format Cartridge Type Native Capacity GB Native Read Transfer Rate MB second SDLT 320 SDLT I 160 16 0 SDLT 220 SDLT I 110 11 0 DLT 8000 DLT IV 40 4 0 DLT 7000 DLT IV 35 3 5 DLT 4000 DLT IV 20 1 5 DLT 1 VS80 DLT IV 40 3 0 Notes Transfer rates quoted are nominal measured reading uncompressed data Non SDLT drives will eject a...

Page 52: ...CHAPTER 3 Drive Specifications ...

Page 53: ...uidelines when working with the tape system Pre Installation Guidelines describes proper steps to take before the drive is installed in a system This includes recording the model and serial numbers checking that the proper SCSI controller and cable have been delivered and checking the drive for proper operation before installing it into a system Configuring and Installing an Internal Tape Drive de...

Page 54: ...res described here and in other sections of the manual 1 Remove power from the system before installing or removing the tape drive to prevent the possibility of electrical shock or damage to the tape drive Unplug the unit that contains or is to contain the drive from AC power to provide an added measure of safety 2 Read understand and observe all label warnings 3 The POS uses a Class I laser produ...

Page 55: ...ve Never place the tape drive so that it rests on its front bezel Always gently place the drive flat printed circuit board PCB side down on an appropriate ESD protected work surface to avoid the drive being accidentally knocked over Do not pack other materials with the drive in its anti static bag Place the drive in the anti static bag before placing it in a shipping container Do not stack objects...

Page 56: ...d problems Use a properly installed anti static pad on your work surface Always use a properly fitted and grounded wrist strap or other suitable ESD protection when handling the tape system and observe proper ESD grounding techniques Hold the drive only by its sides Do not touch any components on the printed circuit board assembly PCBA Leave the drive in its anti static bag until you are ready to ...

Page 57: ...d will be very helpful if you have to contact technical support These numbers can be found on the bottom of the drive enclosure 3 Check the SCSI cable to ensure it is compatible with the SCSI controller card in the host computer 4 Check the SCSI interface on the host computer to ensure that it is compatible with the drive Possible interfaces include MSE single ended MSE low voltage differential or...

Page 58: ...ncludes the following Setting the SCSI ID for the drive default SCSI ID 5 Configuring the drive to provide TERMPWR Setting the configuration jumper default wide SCSI enabled If you want to change any of the settings refer to the applicable subsection otherwise proceed directly to the tape drive s installation procedures in Installing the Internal Tape Drive on page 4 10 CAUTION Before you begin re...

Page 59: ... pin SCSI ID block located on the back of the drive Figure 4 1 on page 4 8 or In a library setting you can set the IDs through firmware The firmware default is SCSI ID 5 and no jumpers are installed on the jumper block NOTE The default setting for the tape drive is 5 the host adapter setting is typically SCSI ID 7 If you choose to omit all jumpers from the SCSI ID block the tape drive will use the...

Page 60: ...g Port 8 pin Diagnostic use only Configuration Jumper Omit jumper on Pins 1 2 to enable wide SCSI SCSI ID Jumper Block No jumpers on this block default SCSI ID of 5 TERMPWR Block Install jumper on Pins 1 2 to enable TERMPWR SCSI Port 68 pin Denotes Pin 1 orientation Pin 1 Power Connector 4 pin Loader Connector RS 422 8 pin Figure not drawn to scale ...

Page 61: ... 0 0 0 1 2 1 0 0 1 0 3 1 0 0 1 1 4 1 0 1 0 0 5 default 0 0 0 0 0 6 1 0 1 1 0 7 1 0 1 1 1 8 1 1 0 0 0 9 1 1 0 0 1 10 1 1 0 1 0 11 1 1 0 1 1 12 1 1 1 0 0 13 1 1 1 0 1 14 1 1 1 1 0 15 1 1 1 1 1 0 No Jumper installed 1 Jumper installed Jumpering Pins 9 10 forces the drive to ignore the firmware value and read the value jumpered on the block ...

Page 62: ...SCSI The 8 pin Configuration Jumper block allows you to enable or disable the wide SCSI bus The default setting is for the wide SCSI bus to be enabled there is no jumper across Pins 1 and 2 when wide SCSI is enabled Figure 4 1 on page 4 8 To disable wide SCSI install a jumper across Pins 1 and 2 Pins 3 through 8 are reserved and require no jumpering 4 3 4 Installing the Internal Tape Drive Install...

Page 63: ...f mounting possibilities for tape drives the instructions presented here are general in nature They should be used only as a guide for mounting the drive in your system Mount the drive in the system by performing the following steps 1 Position the drive in the system and align the drive mounting holes side or bottom with those in the system Figure 4 5 on page 4 12 shows the mounting locations and ...

Page 64: ... three connectors on the back of the internal SDLT drive that are discussed in this section are 1 SCSI 2 power and 3 optional library loader connectors For the tabletop model typical connectors power cords are shown in Figure 4 8 on page 4 23 SCSI and Power Connectors Figure 4 6 on page 4 14 shows the pin orientation for the 68 pin SCSI connector and 4 pin power connector located on the back of th...

Page 65: ...s drive may need to be terminated if the SDLT drive is the only device connected to the SCSI bus OR if the SDLT drive is one of several devices connected to the SCSI bus and it is the last device connected to the SCSI bus 4 If the answer to step 3 was affirmative attach a Y connector to the drive s SCSI connector then attach the SCSI cable to one leg of the Y and attach the terminator to the other...

Page 66: ...r Pin Assignments Signal Name Pin Number Pin Number Signal Name Ground 1 35 DB 12 Ground 2 36 DB 13 Ground 3 37 DB 14 Ground 4 38 DB 15 Ground 5 39 DB P1 Ground 6 40 DB 0 Ground 7 41 DB 1 Ground 8 42 DB 2 Ground 9 43 DB 3 Ground 10 44 DB 4 Ground 11 45 DB 5 Ground 12 46 DB 6 Ground 13 47 DB 7 Ground 14 48 DB P0 Ground 15 49 Ground ...

Page 67: ...5 ATN Ground 22 56 Ground Ground 23 57 BSY Ground 24 58 ACK Ground 25 59 RST Ground 26 60 MSG Ground 27 61 SEL Ground 28 62 C D Ground 29 63 REQ Ground 30 64 I O Ground 31 65 DB 8 Ground 32 66 DB 9 Ground 33 67 DB 10 Ground 34 68 DB 11 Note The minus sign next to a signal indicates active low Table 4 2 MSE and SE Mode SCSI Connector Pin Assignments Continued ...

Page 68: ... P1 DB 0 6 40 DB 0 DB 1 7 41 DB 1 DB 2 8 42 DB 2 DB 3 9 43 DB 3 DB 4 10 44 DB 4 DB 5 11 45 DB 5 DB 6 12 46 DB 6 DB 7 13 47 DB 7 DB P 14 48 DB P Ground 15 49 Ground DIFFSENS 16 50 Ground TERMPWR 17 51 TERMPWR TERMPWR 18 52 TERMPWR Reserved 19 53 Reserved Ground 20 54 Ground ATN 21 55 ATN Ground 22 56 Ground BSY 23 57 BSY ACK 24 58 ACK RST 25 59 RST MSG 26 60 MSG SEL 27 61 SEL C D 28 62 C D REQ 29 6...

Page 69: ... 14 3 37 DB 14 DB 15 4 38 DB 15 DB P1 5 39 DB P1 Ground 6 40 Ground DB 0 7 41 DB 0 DB 1 8 42 DB 1 DB 2 9 43 DB 2 DB 3 10 44 DB 3 DB 4 11 45 DB 4 DB 5 12 46 DB 5 DB 6 13 47 DB 6 DB 7 14 48 DB 7 DB P 15 49 DB P DIFFSENS 16 50 Ground TERMPWR 17 51 TERMPWR TERMPWR 18 52 TERMPWR Reserved 19 53 Reserved ATN 20 54 ATN Ground 21 55 Ground BSY 22 56 BSY ACK 23 57 ACK RST 24 58 RST Table 4 3 MSE LVD Mode SC...

Page 70: ...Tape Drive MSG 25 59 MSG SEL 26 60 SEL C D 27 61 C D REQ 28 62 REQ I O 29 63 I O Ground 30 64 Ground DB 8 31 65 DB 8 DB 9 32 66 DB 9 DB 10 33 67 DB 10 DB 11 34 68 DB 11 Table 4 4 HVD Mode SCSI Connector Pin Assignments Continued ...

Page 71: ...umber Signal Name 1 12 VDC 2 Ground 12V return 3 Ground 5V return 4 5 VDC Table 4 6 8 Pin Loader Connector Pin Assignments Signal Name Pin Number Pin Number Signal Name Ground 1 5 SEND_TO_LOADER_H REC_FROM_LOADER_H 2 6 SEND_TO_LOADER_L REC_FROM_LOADER_L 3 7 Ground Ground 4 8 LOADER_PRESENT_L ...

Page 72: ...for the tabletop drive This model tape drive is normally configured to meet customer specifications before leaving the factory so should not require any internal configuration changes on site Figure 4 7 Back Panel of the Tabletop Model SCSI ID The SCSI ID default for the tabletop drive is set to 3 the drive can be configured for SCSI ID addresses that range from 0 to 15 using the SCSI ID pushbutto...

Page 73: ... SCSI device then install a SCSI bus cable between the open connector and the next device on the bus 1 Prior to connecting the SDLT drive to the host computer make sure the drive and computer are turned OFF 2 If you are connecting several devices to the SCSI bus connect only the drive to the host computer at this time Confirm that the host computer and drive are communicating correctly before addi...

Page 74: ...uld be a minimum of 18 3 AWG 60 C type SJT or SVT UL and CSA certified cordage rated for use at 250 VAC with a current rating that is at least 125 of the current rating of the product The AC plug must be terminated in a grounding type male plug designed for use in your country or region It must also have marks showing certification by an agency acceptable in your country or region The tabletop uni...

Page 75: ...rive connect the other end of the cord to the AC outlet Upon completion proceed to the next section to confirm the installation 4 5 Confirming the Installation To confirm the installation power on the SDLT system and the host computer The screens displayed at power up contain BIOS operating system and SCSI controller information If the first screen displays host adapter and SCSI ID information the...

Page 76: ...CHAPTER 4 Installing Your Tape Drive ...

Page 77: ...bes how to backup a sample file to ensure proper operation of the system Overwriting 320 Formatted Cartridges in a 220 Drive describes what happens when an SDLT 220 drive is instructed to overwrite the tape cartridge using a 220 specific format Updating the Firmware describes how to update the firmware microcode that resides inside the tape drive and controls its behavior Cleaning the Tape Mechani...

Page 78: ...pletely into the system The tape will load automatically Choose a sample file set from the host computer Perform a back up and then restore the file set The system has been correctly installed if the back up is completely restored without any errors If you experience errors doublecheck the drive s configuration and setup using the ideas provided in Troubleshooting on page 5 13 After you have exhau...

Page 79: ...ucted to overwrite the cartridge with a 220 format NOTE This discussion applies only to SDLT 220 drives firmware revision V45 and higher When a 320 formatted cartridge is overwritten in a 220 drive all 320 formatted data on that cartridge is lost forever This includes any future attempt to space past the 220 formatted data into the old 320 formatted data in an attempt to perform heroic data recove...

Page 80: ... about the suite of diagnostics tools provided by Tandberg Data refer to Tandberg Data s web site www tandberg com Follow the path Support DLT Support 5 4 1 Update the Firmware Using the SCSI Bus SDLT Update is a tool that allows you to update a drive s firmware using the SCSI bus or to create a code update CUP FUP tape for an SDLT drive SDLT Update is available on Tandberg Data s web site http ww...

Page 81: ...t it 3 Press and hold the Eject button for six seconds after six seconds the Amber Write Protect LED will begin to blink 4 Release the Eject button then quickly press and release the Eject button again At this point the Amber and Green LEDs start blinking synchronously in a regular rhythmic pattern The drive is now in Firmware Upgrade mode You now have a window of one minute to insert the tape car...

Page 82: ...ive is mounted in a tape automation library the tape is not automatically ejected but it is rewound to BOT and unbuckled in preparation for unloading 5 4 4 Troubleshooting the Firmware Code Update Try these remedial actions if the drive s firmware code update fails Updating the same revision If a Code Update is requested and the code revision being updated is the same as the code revision already ...

Page 83: ...s necessary 5 5 1 Occasional Cleaning of Tape Head SDLT drives may not require preventative cleaning because of improvements in the head design The frequency of cleaning is dictated to a large degree by the amount of ambient pollution and particulates in the environment For details refer to Particulate Contamination Limits on page 3 15 Do not clean your drive unless cleaning is indicated Your back...

Page 84: ... The tape cleaning algorithm is not used for the backward read compatible BRC head this head style does not need cleaning 5 5 3 Life Expectancy of the Cleaning Tape Each SDLT Cleaning Tape is good for 20 uses Use one of the Quantum supplied labels that come with the tape to keep track of the number of uses 5 5 4 Compatibility of the Cleaning Tape The SDLT Cleaning Tape is intended for use in SDLT ...

Page 85: ...til the drive engages with the cartridge and begins to take up the cleaning media The green Drive Status LED will blink and the cleaning cycle will begin automatically 2 When the cleaning cycle completes the cartridge automatically ejects from the drive and the yellow alert LED turns off NOTE On the last cleaning the cleaning cartridge will not eject Use the Eject button on the front of the drive ...

Page 86: ...the tape system s activities This section also describes the behavior of the amber colored LED formerly Write Protect on the SDLT 320 drive This LED is now defined as the Density Indicator as shown in Table 5 2 Table 5 2 Behavior of the Amber LED When a Tape Cartridge is Loaded Cartridge Type SDLT 220 SDLT 320 DLT IV LED is illuminated LED is not illuminated SDLT I LED is not illuminated LED is il...

Page 87: ...CHAPTER 5 Using Your Tape Drive Figure 5 1 SDLT 220 and SDLT 320 Front Panels A Comparison SDLT 220 SDLT 320 ...

Page 88: ...winding the tape the tape is loading unloading or rewinding ON The drive is idle There may or may not be a cartridge in the tape drive OFF There is no Off state Cleaning Required Right Yellow Cleaning Required See Cleaning the Tape Mechanism on page 5 7 Eject Button Use the Eject button to eject the tape cartridge from the drive When you press the button the drive completes any active writing of d...

Page 89: ...tape system fails its POST If after attempting the recommended actions listed in the table the problem still exists or recurs a hardware failure may be the cause Contact your service representative Table 5 4 Troubleshooting Chart If Then You should System does not recognize the tape system System may not be configured to recognize the SCSI ID Configure system to recognize the tape system s ID SCSI...

Page 90: ...number of devices on the bus including the SCSI adapter to match the limits of the interface being used A device may not have been turned on and a valid SCSI ID may not have been configured prior to the system powering on and loading BIOS Turn drive power on first and then turn on power to the system Do this so that the drive is properly recognized by the system The tape system does not power up N...

Page 91: ...nloaded and ejected from the drive As long as the drive is not mounted in a tape automation library the tape is ejected SCSI status will indicate the drive is in the over temperature condition NOTE If the drive is mounted in a tape automation library the tape is not automatically ejected for details refer to a separate document Super DLT Design and Integration Guide TD part number 432588 rev 01 or...

Page 92: ...CHAPTER 5 Using Your Tape Drive ...

Page 93: ...SCSI signals and provides bus timing values 6 1 SCSI Overview The Small Computer System Interface SCSI is a specification for a peripheral bus and command set that is an ANSI standard The standard defines an I O wide SCSI bus that supports up to 16 devices 15 SCSI devices and one host adapter ANSI defines three primary objectives for SCSI 2 1 To provide host computers with device independence with...

Page 94: ...pen d only on d evice implementation and c able length Logica l addr essing for all da ta blocks rather than physical addr essing Multiple initiators and multiple targets Distributed arbitration bus c ontention logic Command set enhancement For more details about specif ic SCSI commands or messages refer to a separate document Super DLT SCSI InterfaceGuide P N 432614 rev 01 or later ...

Page 95: ...mplete the logical position is before the specified position LOG SELECT 4Ch Optional Provides a means for the initiator to manage statistical information maintained by the drive about the drive This standard defines the format of the log pages but does not define the exact conditions and events that are logged LOG SENSE 4Dh Optional Provides a means for the initiator to retrieve statistical inform...

Page 96: ...cal unit SEND DIAGNOSTIC 1Dh Mandatory Requests the drive to perform diagnostic operations on itself SPACE 11h Mandatory Provides a selection of positioning functions both forward and backward that are determined by the code and count TEST UNIT READY 00h Mandatory Provides a means to check if the logical unit is ready VERIFY 2Fh Optional Requests the drive to verify the data written to the medium ...

Page 97: ...Optional Used to register and reserve the drive through resets and power cycles RELEASE 10 57h Mandatory Used to release a previously reserved unit REPORT DENSITY SUPPORT 44h Mandatory Requests the drive report the density codes and some identifying information for all supported medium formats REPORT DEVICE IDENTIFIER A3h Optional Used to retrieve the information saved in the drive by a SET DEVICE...

Page 98: ... detect errors in transmission across SCSI and trigger a resend of the bad data 6 5 Signal States The following paragraphs describe signal values and SCSI IDs 6 5 1 Signal Values All signal values are actively driven true low voltage Because the signal drivers are OR tied the bus terminator s bias circuitry pulls false when it is released by the drivers at every SCSI device If any device asserts a...

Page 99: ...ignal is driven by all SCSI devices that are actively arbitrating SCSI ID Each SCSI device that is actively arbitrating asserts its unique SCSI ID bit The other seven or fifteen data bits are released The parity bit DB P or P1 can be released or driven true but is never driven false during this phase I T The signal is driven by the initiator drive or both as specified in the SELECTION and RESELECT...

Page 100: ...d to it This SCSI ID provides an address for identifying the device on the bus On the drive the SCSI ID is assigned by configuring jumpers or connecting remote switches to the option connector For detailed instructions about how to set the SCSI ID refer to Setting the Internal Drive SCSI ID on page 4 7 6 6 SCSI Signals The following subsections define SCSI signals and bus timing values ...

Page 101: ...lue is true low voltage and 0 when the signal value is false high voltage Data parity DB P is odd Parity is undefined during ARBITRATION DB 15 8 P1 data bus Eight data bit signals plus one parity bit signal that forms an extension to the DATA BUS They are used for 16 bit wide interfaces DB 15 is the most significant bit and has the higher priority but below bit DB 0 during ARBITRATION Bit number s...

Page 102: ...s 1 2 µs from BSY and SEL first becoming both false If a SCSI device requires more than a bus settle delay to detect BUS FREE it clears the bus within a bus clear delay minus the excess time Bus Free Delay 800 ns Maximum time a SCSI device waits from its detection of BUS FREE until its assertion of BSY when going to ARBITRATION Bus Set Delay 1 8 µs Maximum time for a device to assert BSY and its S...

Page 103: ...election Time 250 ms1 Recommended maximum time after a hard RESET condition until a drive is able to respond with appropriate status and sense data to the TEST UNIT READY INQUIRY and REQUEST SENSE commands Reset Hold Time 25 µs Minimum time for which RST is asserted there is no maximum time Selection Abort Time 200 µs Maximum time that a drive or initiator takes from its most recent detection of b...

Page 104: ...CHAPTER 6 SCSI Description ...

Page 105: ...bient electromagnetic fields and describes the susceptibility of the system to unexpected electrostatic discharge Acoustic Noise Emissions describes compliance with various acoustic standards 7 1 Safety Regulations This section lists the safety regulations that the SDLT tape system meets or exceeds such as UL CSA EN IEC and GS Mark 7 1 1 Safety Certifications The SDLT tape system meets or exceeds ...

Page 106: ...ncluding Electrical Business Equipment 7 2 Electromagnetic Field Specifications Tandberg SDLT tape d rives are electricaldev ices as such this equipment generates uses and may emit radio frequency energy The drives may emit energy in other frequencies as well as discussed in the following subsections 7 2 1 Electromagnetic Emissions The internal version of the tape system complies with FCC Class A ...

Page 107: ...le 7 2 Table 7 1 EMI Regulations and Certifications Type Regulation Certification EEC Directive 89 336 CE BS6527 UK EN55022 EU EN55024 EU CFR 47 1995 FCC Rules Part 15B Class B MDOC IECS 003 Canada V 3 97 04 VCCI Class B Japan CNS 13438 BSMI Class A Taiwan AS NZS 3548 Australia New Zealand C Tick Mark Table 7 2 Conducted Emissions Frequency Range Limits dB Quasi peak Average 0 15 to 0 50 MHz 66 to...

Page 108: ...rence field strength in the frequency range from 30 MHz to 1000 MHz at a test distance of 10 meters are listed in Table 7 3 Table 7 3 Radiated Emissions Frequency Range Quasi peak limits dB µV m Class A Class B 30 to 230 MHz 40 30 230 to 1000 MHz 46 37 Above 1000 MHz 54 Not applicable ...

Page 109: ...r Cables 1 2 kV Differential 2 5 kV Common mode No errors Low level Conducted Interference for AC and DC Cables 3 V m rms 80 modulated 1 kHz 0 15 80 MHz No errors No screen distortion The SDLT system shall maintain normal operation both in Read Write and in Standby conditions No errors attributable to the test shall be encountered Conducted The transient voltage is the actual peak voltage above th...

Page 110: ...und pressure Table 7 6 Acoustic Noise Emissions Nominal Acoustics Preliminary declared values per ISO 9296 and ISO 7779 EN27779 Mode Noise Power Emission Level LNPEc Internal Version Tabletop Version Idle Not applicable 5 4 Bel Streaming 5 9 Bel 5 9 Bel Mode Sound Pressure Level LPAc Internal Version Tabletop Version Idle Not applicable 42 dB Streaming 47 dB 53 dB ...

Page 111: ...to a previous generation DLT drive By following general handling procedures conducting careful visual inspections of tape cartridges on a regular ongoing basis and making sure that tape cartridges are stored within their environmental limits you will greatly reduce any chance that you will experience problems with your tape cartridges or cause damage to your SDLT system Respect your media as much ...

Page 112: ...vironment for the tape cartridge is If storage or transportation of a tape cartridge has exposed it to conditions outside the ambient values above you should condition the tape cartridge to its operating environment for a 24 hour period Do not place cartridges on or near devices that may produce magnetic fields such as computer monitors motors or video equipment Such exposure can alter or erase da...

Page 113: ...ub reel and drive gear from meshing Maintain clean operating working and storage environments Follow all tape cartridge handling instructions that accompany your cartridges or tape drive A 2 Tape Cartridge Inspection Procedure Ensure that your tape backup solution performs reliably by following the Visual Mechanical Inspection VMI procedures described in this subsection These steps will help you i...

Page 114: ... SDLT I Cartridge Check the reel lock openings and ensure that the small plastic tabs inside are partially visible The reel locks are black in color Like any plastic part the reel locks can break if the cartridge is dropped If the reel lock tabs are not visible do not use the cartridge Figure A 2 Bottom View of SDLT I Cartridge 3 Look at the tape cartridge to check for any obvious cracks or other ...

Page 115: ...the write protect switch on the front of the cartridge Figure A 3 Figure A 3 Write Protect Switch on Tape Cartridge Move the write protect switch to the left to enable write protection existing data on the tape cannot be overwritten nor can additional data be appended to the media When the write protect switch is moved to the left a small orange rectangle is visible This indicates that data cannot...

Page 116: ... Visible Data cannot be written to the tape Existing data on the tape cannot be overwritten Additional data cannot be appended to the media Disabled Not Visible Unless the cartridge is write protected via software Data can be written to the tape Existing data on the tape can be overwritten Additional data can be appended to the media After Loading the Cartridge and During Operation If the write pr...

Page 117: ... into the front of the tape drive refer to Figure A 4 as needed 1 Insert the cartridge 2 Push the cartridge fully into the tape drive The Drive Status LED blinks to show that the tape is loading When the tape reaches the BOT marker the LED lights steadily The tape is now ready for use Figure A 4 Front Panel LEDs ...

Page 118: ...ve and the drive is instructed to overwrite the cartridge with a 220 format A scenario like this might be possible in a tape automation library where tapes are being drawn from a large pool usually with minimal human interaction While a 320 formatted cartridge is loading in a 220 drive the drive will report 02 04 01 Not Ready Calibration in Progress in response to Test Unit Ready TUR commands unti...

Page 119: ...ive On the other hand REWIND commands will report an error condition if mechanical or servo related problems occur If a READ SPACE or LOCATE command is sent to an SDLT 220 drive containing a 320 cartridge the drive will report a 05 30 02 Incompatible Format Cannot Read Medium check condition This includes Space Block or Filemark in either a positive or negative direction The only exception to the ...

Page 120: ...APPENDIX A SDLT I Tape Cartridge ...

Page 121: ... on a regular ongoing basis and making sure that tape cartridges are stored within their environmental limits you will greatly reduce any chance that you will experience problems with your tape cartridges or cause damage to your SDLT system Respect your media as much as you do your data This appendix discusses the DLT IV tape cartridge refer to SDLT I Tape Cartridge for SDLT I cartridge informatio...

Page 122: ...perating environment for the tape cartridge is If storage or transportation of a tape cartridge has exposed it to conditions outside the ambient values above you should condition the tape cartridge to its operating environment for a 24 hour period Do not place cartridges on or near devices that may produce magnetic fields such as computer monitors motors or video equipment Such exposure can alter ...

Page 123: ...ub reel and drive gear from meshing Maintain clean operating working and storage environments Follow all tape cartridge handling instructions that accompany your cartridges or tape drive B 2 Tape Cartridge Inspection Procedure Ensure that your tape backup solution performs reliably by following the Visual Mechanical Inspection VMI procedures described in this subsection These steps will help you i...

Page 124: ... the tape cartridge holding it as shown in Figure B 1 now look at the bottom of the tape cartridge holding it as shown in Figure B 2 Check the reel lock openings and ensure that the small plastic tabs inside are partially visible Like any plastic part the reel locks can break if the cartridge is dropped If the reel lock tabs are not visible do not use the cartridge Figure B 2 Bottom View of DLT Ca...

Page 125: ...n of the cartridge Using your thumb gently lift up on the tab and swing the door open 8 Inside the door you will see the tape and cartridge leader loop The loop should stick up about an eighth of an inch when viewed from the edge the loop must be a closed loop If the loop is torn bent pulled in or not sticking up about an eighth of an inch do not use the tape cartridge Figure B 4 shows three diffe...

Page 126: ...APPENDIX B DLT IV Tape Cartridge Figure B 4 Tape Cartridges with Damage Visible During Visual Inspection ...

Page 127: ...tridge has a write protect switch Figure B 5 that can be used to prevent accidental erasure of data Since the DLT IV cartridge is a read only cartridge when used in the SDLT drive the write protect switch in this configuration is not used Figure B 5 Write Protect Switch on Tape Cartridge ...

Page 128: ...artridge into a Non Backward Read Compatible Non BRC tape drive the drive ejects the cartridge Figure B 6 Front Panel LEDs 2 If you have loaded a DLT IV cartridge into a Backward Read Compatible BRC tape drive the cartridge is accepted The Mode Sense information will report the Media Type as 85h and the correct Density Code as read from the tape Additionally the Write Protect WP bit in the Mode Se...

Page 129: ... 1 Press the Eject button or issue an appropriate system software command the drive completes any active writing of data to the tape The Drive Status LED blinks as the tape rewinds When the tape is finished rewinding the drive ejects the cartridge and the Drive Status LED lights steadily 2 Remove the cartridge from the drive and return the cartridge to its plastic case to protect the cartridge fro...

Page 130: ...APPENDIX B DLT IV Tape Cartridge ...

Page 131: ...provides high encoding efficiency recording densities for greater capacity and performance Allocation The process of assigning particular areas of the media to particular data or instructions AMP Media Advanced Metal Powder Media A state of the art media designed for SDLTtape It incorporates durable metal powder technology for high density data storage and embedded non magnetic information for hea...

Page 132: ...a drive activity LED BIOS Basic Input Output System A set of routines that work closely with the hardware to support the transfer of information between various elements of the system such as memory disks and peripheral devices Block A sector or group of sectors By default a sector of data consists of 512 bytes BOT Beginning of Tape The physical beginning of the tape BRC Backward Read Compatibilit...

Page 133: ...pe ejection the cartridge receiver assembly reverses the process and automatically ejects the tape a fixed distance from the front of the drive Compressed Capacity Capacity after data has been processed using either software or hardware to reduce storage space while maintaining data integrity CSA Canadian Standards Association also known as CSA International CTM Cartridge Tape Module The main func...

Page 134: ...s for the all tape motion inside the drive and to write data to and read data from the tape Device According to the SCSI specification up to eight SCSI devices can be connected to a single SCSI bus Each SCSI device contains a SCSI ID number that can be set to 0 7 Device Driver A low level usually kernel mode operating system component that enables a PC to communicate with peripheral devices such a...

Page 135: ...M or EOT End of Media or End of Tape Logical EOM allows space to complete a write operation physical EOM signifies that the tape is completely used Erase The removal of data from a piece of media Error A message that occurs when there is a loss of ability to interpret recorded data Usually due to magnetic issues or defects in or on the media ESD Electrostatic discharge A sudden discharge of electr...

Page 136: ...used to create and read back the magnetic patterns on the tape Also known as the read write head HiFN An ASIC Application Specific Integrated Circuit for the SDLT that handles data compression HIM Host Interface Module This board is one of two boards that make up the EIM The HIM implements the interface between the host system and the drive HRE Hard Read Error HVD High Voltage Differential HVD tra...

Page 137: ...ve that manages the exchange of data between the drive and computer The most common interfaces for small computer systems are AT IDE and SCSI Jumper A tiny connector box that slips over two pins that protrude from a circuit board When in place the jumper connects the pins electrically The jumper can be moved to change electrical connectors KB Kilobyte A unit of measure equal to 1 thousand 1024 byt...

Page 138: ...ty The capacity of a given media product in its native recording format without the use of data compression Native Mode Refers to the uncompressed storage capacity of a tape subsystem See Native Capacity Parity A method of generating redundant information that can be used to detect errors in stored or transmitted data Peripheral A device added to a system as a complement to the basic CPU such as a...

Page 139: ...er countries SE Single Ended A term referring to the electrical characteristics of the signal used on the SCSI bus interface For each signal that needs to be sent across the bus there exists a wire to carry it SE SCSI uses one line for each signal with all lines using a common ground reference Seek The movement of a read write head to a specific data track Server A powerful computer system with a ...

Page 140: ... unit of measure equal to 1000 Gigabytes GB TCM Tape Control Module The SDLT TCM consists of a variety of components the most significant of these include the base plate the cartridge receiver the tape supply motor assembly the floor plate assembly and the buckling mechanism Termination A physical requirement of the SCSI bus A device that attaches to both ends of an electrical bus and prevents ref...

Page 141: ...ation Unformatted Capacity The total number of usable byes on the media including the space that will be required later to record location boundary definitions and timing information See also Native Capacity XEZ An ASIC Application Specific Integrated Circuit for the SDLT ...

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