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__________________________________________________________________________

Tandberg SLR Reference Manual

5-1

5.

Data Reliability

5.1. Summary

This chapter deals with data reliability. It starts with a general introduction including important

points for the system designer, and then goes on to describe the algorithm employed during

write- and read- operations when errors occur. The important message is that MEDIA

ERRORS WILL OCCUR, even in the best designed system, and the Tandberg SLR Product

Line Drives are designed to deal with these errors in a very efficient way.

5.2. General Introduction

Data Reliability

Data reliability is a function of many variables such as:

•

Tape and cartridge quality

•

Head quality

•

The design of the read- and write-electronics

•

Capstan quality

•

Capstan motor and servo system

•

Quality of the mechanical locking system, the cartridge-
guides and the head positioning system

•

Quality of tape handling

•

Drive mounting in the host chassis

•

Cleaning and maintenance

•

Cleanness of the air surrounding the Drive and tape

•

Quality of the power-supply connected to the Drive

•

Quality of the way data-errors are treated by the formatter

•

ECC algorithm

•

Operating and storage environments

Features Given

Special Attention

The Drive is designed and constructed for optimal quality to ensure a low error rate. Here are

some of the features that have been given special attention:

•

The Drive mechanism is mounted on a rigid casting

•

The locking mechanism ensures that the cartridge always
locks in the same position

•

The head positioning system is able to position the head
within very narrow tolerances

•

The write and the read channels incorporate many new
signal processing features which improve the recording

and reading on marginal tapes

•

A sophisticated head positioning system that includes
multistep off-track alignment for reading marginal data

blocks

•

Stand-by position (head removed from the tape) when the
tape is not running

•

Intelligent error recovery algorithms handles dropouts and
disturbances

•

Very powerful ECC algorithm

•

Power shut-down when the tape is not running

•

Switchable Read Threshold

•

Conditional retensioning of tape

Содержание SLR7

Страница 1: ...andberg SLR7 SLR50 SLR60 SLR75 SLR100 SLR140 REFERENCE MANUAL TANDBERG DATA ASA P O Box 134 Kjels s N 0411 OSLO NORWAY Phone 47 22 18 90 90 Telefax 47 22 18 95 50 Tandberg Data ASA Part No 43 04 44 11...

Страница 2: ...publishing this information Tandberg Data ASA conveys no license under any patent or any other rights Every effort has been made to avoid errors in text and diagrams However Tandberg Data ASA assumes...

Страница 3: ...harge EN 61000 4 2 4 3 4 3 3 Susceptibility to Fast Transient Burst EN 61000 4 4 4 3 4 3 4 Susceptibility to Conducted Disturbances Induced by Radio Frequency Field EN 61000 4 6 4 3 4 3 5 Susceptibili...

Страница 4: ...al Introduction 1 5 2 1 Important SLR7 60 75 100 140 Recommendation 2 5 3 Write Mode 3 5 4 Read Mode 3 5 5 Cartridge Conditioning 3 6 Track Tape format and Encoding Specifications 1 6 1 Summary 1 6 2...

Страница 5: ...ce 1 8 2 Definition of Terms 1 8 3 Electrical Interface 2 8 3 1 Drive Interface Connector Layout 2 8 3 2 Bus Signals 4 8 3 3 SCSI Interface Timing 5 8 3 4 SCSI Termination 7 8 4 Bus Phases 7 8 4 1 Sum...

Страница 6: ...Use 19 11 Preventive Maintenance 1 App A Initialization and Power on Selftest Marker Codes 1 A 1 Initialization Marker Codes 1 A 2 Power on Selftest Codes 2 App B Manual Cartridge Eject 1 App C LED I...

Страница 7: ...SLR7 SLR50 SLR60 SLR75 SLR100 and SLR140 SCSI compatible Streaming Quarter inch Tape Cartridge Drives Tandberg Data ASA will appreciate any comments on this publication regarding discrepancies between...

Страница 8: ...Tandberg Data Preface ___________________________________________________________________________ 0 2 Tandberg SLR Reference Manual This Page Intentionally Left Blank...

Страница 9: ...CSI hardware and software specifications and thus is able to control the SCSI compatible Tandberg SLR Product Line Drive 1 2 Introduction to this Manual This manual is intended to be the main referenc...

Страница 10: ...cs possibilities Chapter 11 Describes how to perform proper preventive maintenance Appendix A Lists the various Self Diagnostics error codes supported by the Drive Appendix B Describes the manual cart...

Страница 11: ...sec 8 16 bit SCSI SE LVD ALRF 23 The Tandberg SLR product line is equipped with SCSI interface and supports a variety of data transfer rates The product is also designed to support older media types a...

Страница 12: ...ormance Basic Mechanical Building Blocks The Drive mechanism is built inside a rigid aluminum die casting The mechanism includes a direct drive brushless capstan motor a load and eject system for the...

Страница 13: ...ard Flex cables are used to connect the different PCBs The Mainboard drive electronics comprises the MC68331 microprocessor and the FAS368M SCSI controller plus several custom made ASICs to handle dat...

Страница 14: ...Block Marker Randomizer Seed Control Field Data 512 bytes CRC Pad Field Randomized VR2 RLL Coded Standard Data Block ALRF 1 ALRF 2 ALRF 6 Figure 2 2 Track formats ECC blocks not shown Write Operation...

Страница 15: ...eparator Read Filter Erase Pre amplifier Capstan Servo Step Motor Driver CAM Motor Driver Hole Sense Data Path Controller ASIC Data Com pression DRAM Buffer Head SCSI bus Voice Coil Motor Capstan Moto...

Страница 16: ...50 Data Path Controller The DPC Data Path Controller is a digital ASIC designed by Tandberg Data which is designed to communicate with the SCSI controller the data compression circuit the data buffer...

Страница 17: ...brings higher density and performance compared to the peak detection mechanism implemented on the SLR24 50 The read back signal coming from the head is amplified and shaped by the Preamplifier and REA...

Страница 18: ...r the two tape hole positions upper and lower to provide very high system reliability especially against tape runout The sensitivity of the sensors are adjusted to achieve good design margins Pulsed l...

Страница 19: ...eaning Tape Running 53 ips 5 V 12 V 5 V 12 V 5 V 12 V RMS Current 1 2 A 2 0 A 1 2 A 2 0 A 1 5 A 1 3 A Peak Current 1 5 A 4 0 A 1 5 A 4 0 A 2 0 A 2 1 A The Drive is verified to be within specifications...

Страница 20: ...Humidity Mode Temperature C Rel Humidity Operating 5 40 20 80 Storage 30 60 5 90 Transport 40 60 5 95 In operating mode these figures are limited by the media Due to additional heating com ing from in...

Страница 21: ...Hz Acceleration G Operating Mode Sine Sweep 5 100 150 500 0 5 0 1 Frequency Profile Hz PSD Level g 2 Hz NOTE 1 Operating Mode Random Sweep NOTE 2 5 17 45 48 62 65 150 200 500 2 0 10 5 1 1 10 3 8 0 10...

Страница 22: ...ity to Electromagnetic Field EN 61000 4 3 The Drive complies with EN 55024 and EN61000 6 2 The Drive mounted in a test cabinet 3 4 3 2 Susceptibility to Electrostatic Discharge EN 61000 4 2 The Drive...

Страница 23: ...11 The Drive complies with EN 55024 and EN61000 6 2 The Drive mounted in a test cabinet 3 4 3 7 Susceptibility to Power Frequency Magnetic Fields EN 61000 4 8 The Drive complies with EN 55024 and EN6...

Страница 24: ...hanics MTTF The failure rate for these parts is related to how often the Drive is actually used In the case of the most critical components which are the head and the capstan motor the reliability is...

Страница 25: ...hannel drive Warranties related to the drive s magnetic head are immediately void if a head is damaged due to use or an attempt to use this kind of tape cartridge Use of older tape cartridge types on...

Страница 26: ...ALRF 2 0 096 mm 0 002 mm 3 6 3 Head Specifications 3 6 3 1 SLR50 pre VU 2000 Head see NOTE Head type Thin film inductive write magneto resistive MR read 3 channel read after write for SLR6 SLR24 MLR3...

Страница 27: ...he head life time specifications stated by Tandberg Data ASA assume running tapes in an environment with an average relative humidity of minimum 40 and maximum of not more than 65 within a temperature...

Страница 28: ...SLR32 120 60 98 4 98 4 98 4 N A SLRtape24 120 60 98 4 98 4 98 4 N A SLRtape7 105 0 70 0 70 0 87 5 87 5 SLRtape5 98 4 118 98 4 98 4 N A N A DC9250 120 N A N A N A N A NOTE Refer to Section 3 6 1 for ot...

Страница 29: ...2GB 1024 data bytes Nominal overhead per block ALRF 1 ALRF 2 ALRF 6 21 25 bytes Preamble 4 Block Marker 0 25 Seed 3 Control Field 8 CRC 6 MLR3 SLR50 5010 DC SLR6 SLR24 29 bytes Preamble 13 Block Marke...

Страница 30: ...als with the situation where the Drive must perform a ECC correction or a read retry operation or both to recover blocks The Soft Read Error Rate is expressed as the total number of recovery operation...

Страница 31: ...x 10 6 5 x 10 7 10 17 QIC 4GB N A N A 1 x 10 7 3 x 10 9 10 15 QIC 2GB N A N A 1 x 10 7 3 x 10 9 10 15 ALRF 2 N A N A 2 x 10 6 1 x 10 6 10 16 Error Rate Specification Tandberg SLR100 Tape Format Hard...

Страница 32: ...sm Double screw worm gear preloaded mechanism controlled by a stepper motor Head movement per step resolution 0 0033 mm 0 0001299 in per step non accumulating Number of steps between adjacent tracks S...

Страница 33: ...transmitter and receivers Synchronous transmitter receiver system digital synchronous demodulation Cartridge sensor Mechanical optical Write protect sensor Mechanical optical 3 6 10 Data Buffer Read W...

Страница 34: ...bit The Reference Bursts will not be overwritten 3 6 13 Stand by Mode When the Drive has been idle for a certain time approx 10 minutes it will enter a low power Stand by Mode Drive being idle means t...

Страница 35: ...e is ejected NOTE The time from the Eject button is activated until the cartridge is ejected may vary depending on the actual ongoing command Up to 4 minutes if a rewind operation is required before E...

Страница 36: ...n Appendix C All LEDs will be lit for 2 seconds at power up 3 6 14 3 Cartridge Insertion and Removal The cartridge must be inserted with the label facing up and the tape dust cover towards the LEDs Sl...

Страница 37: ...9 7 0 5 146 0 0 5 149 0 0 5 212 5 0 5 8 0 0 5 43 0 0 5 41 3 0 5 79 2 0 5 79 2 0 5 79 2 0 5 Right Side View Left Side View Mounting Holes M3 4 on left side of chassis Figure 4 1 Drive Mounting Details...

Страница 38: ...assis a Drive built in high ohmic resistor can be used to drain off the charges via the signal ground to chassis ground provided that the signal ground is con nected to the system chassis However Tand...

Страница 39: ...nts and tests Test selection The layout of the jumper strap connectors are shown in the following UPTST RPLSTST RCLKTST RESET BKPT DSCLK 5V DACI IN DACI OUT READTST0 ENPAR SEL0 SEL1 SEL2 SEL3 NC TERMP...

Страница 40: ...LOSED CLOSED CLOSED CLOSED OPEN OPEN OPEN OPEN CLOSED CLOSED CLOSED CLOSED OPEN OPEN CLOSED CLOSED OPEN OPEN CLOSED CLOSED OPEN OPEN CLOSED CLOSED OPEN OPEN CLOSED CLOSED OPEN CLOSED OPEN CLOSED OPEN...

Страница 41: ...ng up a specific code on the select straps SEL0 SEL3 and by grounding the SELFTST pin during drive power up The coding is as in the following table TEST SEL 3 SEL2 SEL1 SEL0 Meaning CLOSED CLOSED CLOS...

Страница 42: ...cial interface to allow other host operations while the SCSI bus is busy Temporary Host In a SCSI bus system see Figure 4 5 the Host will activate a particular peripheral device when necessary However...

Страница 43: ...internal temperature in the Drive in operating mode is limited by the media The specifications for most Imation cartridges are 5 40 C humidity at 20 80 and maximum Wet Bulb temperature is set to 26 C...

Страница 44: ...Tandberg Data Mounting Specifications ___________________________________________________________________________ 4 8 Tandberg SLR Reference Manual This Page Intentionally Left Blank...

Страница 45: ...aintenance Cleanness of the air surrounding the Drive and tape Quality of the power supply connected to the Drive Quality of the way data errors are treated by the formatter ECC algorithm Operating an...

Страница 46: ...med to do this automatically Prior to use a cartridge should be kept for at least 8 hours in climatic conditions similar to those in which the Drive operates See also IMPORTANT notice in Section 5 5 C...

Страница 47: ...d 5 4 Read Mode Retry Procedure If a data frame has more errors than can be handled by the ECC system the Drive will enter a Read Retry algorithm This algorithm includes the following operation Off ce...

Страница 48: ...may not only occur in areas with a natural high humidity but also in areas with normal or even low humidity A typical example may be a cartridge placed in its packaging box and cooled down during tran...

Страница 49: ...e included The tape format conforms with the ALRF 1 ALRF 2 ALRF 6 MLR3 SLR50 QIC 5010 DC SLR6 SLR24 QIC 4GB and QIC 2GB standards for data interchange Tape Format Standards See the following standards...

Страница 50: ...two interleaved frames 144 data tracks 24 servo tracks Frame with interleave Figure 6 1 QIC 5010 DC and SLR6 SLR24 organizing of data blocks The frame contains 52 data blocks and 12 ECC blocks Both da...

Страница 51: ...sist of four frames labeled A B C and D The frames are divided among the four simultaneously written tracks on the tape The blocks for the four frames are distributed across the four tracks starting f...

Страница 52: ...ronics with the data frequency Three preamble types are recorded Normal Elongated and Long Normal Preamble The Normal Preamble is recorded at the beginning of every block on the track Elongated Preamb...

Страница 53: ...to fill up incomplete Frames so that only complete Frames are written to the tape ECC Contains error correction characters generated by the Drive QIC Drive Identifier Block This block contains inform...

Страница 54: ...of the use of preambles and postambles for different recording situations Type of Recording Preamble Postamble Normal Data Block in a fixed frame Normal Normal Underrun or Write termination Normal Nor...

Страница 55: ...7 rules are used for the SLR50 QIC 5010 DC SLR6 SLR24 tape format Prior to the recording of the data on the tape the randomized data and control information plus the non randomized CRC bytes will be t...

Страница 56: ...of the last CRC byte or during the preamble 6 4 2 1 Encoding The inserted bit is a function of the previous two recorded bits This VR2 RLL insertion is shown pictorially below The logical NOT operatio...

Страница 57: ...explained in VR2 RLL coding Section 6 4 2 1 3 AMPLITUDE The amplitude constraint ensures adequate amplitude content in the encoded data The amplitude metric A can be considered as a counter with a ran...

Страница 58: ...at a fatal write error condition has occurred Write Abort When rewriting bad blocks the following blocks already recorded must also be rewritten whether they have been verified as good or not The Rewr...

Страница 59: ...run During write operations situations may occur where the Host is not able to keep up streaming Underrun is allowed only at frame boundaries If necessary the Drive will insert filler blocks to comple...

Страница 60: ...Pad Field Previous Block Residue of old EOD Marker Elongated Preamble Appended Block Normal Preamble Appended Block Figure 6 7 Normal Data Append ALRF 1 ALRF 2 ALRF 6 MLR3 SLR50 QIC 5010 DC and SLR6 S...

Страница 61: ...d to keep track of partitions and is not accessible from the Host The Device Directory enables the Drive to navigate quickly and efficiently on the tape The Device Directory is updated by the Drive wh...

Страница 62: ...rvo Track bands such that for every reference track head channel combination there is an unique pair of data tracks SLRtape140 SLRtape100 SLRtape60 and SLRtape40 The SLRtape140 SLRtape100 SLRtape75 an...

Страница 63: ...erted The cartridge can not be write protected and must be of a quality that can be written on the actual drive The drive will use the servo or the reference tracks to position the head to track 0 The...

Страница 64: ...ndberg Data Track Tape format and Encoding Specification ___________________________________________________________________________ 6 16 Tandberg SLR Reference Manual This Page Intentionally Left Bla...

Страница 65: ...or Write Filemark commands can be terminated at any position on the tape A termination is true if any other command that repositions the tape except new Write commands is performed At this point the...

Страница 66: ...LEW and Physical End Of Tape the Drive will report CHECK CONDITION and Sense Key INSUFFICIENT CAPACITY after each Write command even if the Write command was executed properly If the Host continues t...

Страница 67: ...st will not be informed when reading past the Logical Early Warning LEW or Early Warning EW point The End Of Partition is reported with CHECK CONDITION 7 10 Unrecoverable Read Error If the Drive has t...

Страница 68: ...Tandberg Data Basic Operational Functions ___________________________________________________________________________ 7 4 Tandberg SLR Reference Manual This Page Intentionally Left Blank...

Страница 69: ...to the SCSI bus CDB Command Descriptor Block Connect Select This function occurs when an INITIATOR selects a TARGET to start an operation Controller A SCSI BUS DEVICE a typical TARGET which con trols...

Страница 70: ...D 4 7 8 38 DB 15 GROUND 5 9 10 39 DB P1 GROUND 6 11 12 40 DB GROUND 7 13 14 41 DB GROUND 8 15 16 42 DB GROUND 9 17 18 43 DB GROUND 10 19 20 44 DB GROUND 11 21 22 45 DB GROUND 12 23 24 46 DB GROUND 13...

Страница 71: ...B 14 DB 15 4 7 8 38 DB 15 DB P1 5 9 10 39 DB P1 DB 6 11 12 40 DB DB 7 13 14 41 DB DB 8 15 16 42 DB DB 9 17 18 43 DB DB 10 19 20 44 DB DB 11 21 22 45 DB DB 12 23 24 46 DB DB 13 25 26 47 DB DB 14 27 28...

Страница 72: ...rtion in dicates input to the Initiator MSG Message A signal driven by the Target indicating the message phase REQ Request A signal driven from the Target indicating a request for an REQ ACK handshake...

Страница 73: ...om ACK in low 30 c Input Cycles 7 tAAROH ACK in low to REQ out high 50 8 tAAROL ACK in high to REQ out low 50 a b 9 tARAOH REQ in high to ACK out high 50 10 tARAOL REQ in low to ACK out low 50 b d 11...

Страница 74: ...sertion period 11 d 6 tSRNEGI REQ in negation period 11 d 7 tSAASTI ACK in assertion period 11 d 8 tSANEGI ACK in negation period 11 d 9 tSDSI Data setup to REQ in or ACK in low 5 10 tSHDI Data hold f...

Страница 75: ...us Phase termed the Information Transfer Phase Message Phase The Tandberg SLR Product Line SCSI Drives support the Arbitration and Reselection features which are optional features in the SCSI standard...

Страница 76: ...bus crash situations in a configuration like this the devices have to arbitrate for the bus If more than one device is requesting the bus simultaneously the one with the highest priority highest SCSI...

Страница 77: ...Selection IDs Mess Out Byte min 1 2 s Figure 8 3 Arbitration Selection and Message Out Phases e The Target will determine that it is selected when SEL and its SCSI ID bit are true and BSY and I O are...

Страница 78: ...that the I O line is asserted Before the Target can reselect it must first go through the Arbitration Phase to gain control of the bus Then the following sequence takes place Having gained control of...

Страница 79: ...s settling delay of at least 400 ns the Target requests the first byte in the Command Descriptor Block by asserting REQ The Initiator responds by placing the first byte on the bus and asserting ACK Th...

Страница 80: ...data to be transferred from the Initiator to the Target in the following way The Target deasserts I O p For each byte the Target asserts REQ The Initiator responds by placing data on the bus and then...

Страница 81: ...EQ ACK First Data In Last Data In min 400 ns min 55 ns min 0 ns min 0 ns DB 0 7 P DB 8 15 P1 Figure 8 7 Data In Sequence This completes the byte transfer This cycle is repeated until the last data byt...

Страница 82: ...s p After a bus settle del ay of 400 ns the Drive puts the Message Byte on the bus and asserts the REQ sig nal The Initiator reads the Message Byte and asserts ACK The Drive deasserts REQ and the Init...

Страница 83: ...line The handshake protocol for the Identify Message is like the one described in Section 8 5 3 Selec tion Phase p The assertion of ATN enables the Target to know which transfer the message refers to...

Страница 84: ...erting ATN later might not be honored until a later Bus Phase and then may not result in the expected action The Drive will respond with Message Out Phase as follows a If ATN becomes true during a Com...

Страница 85: ...et Condition must last at least 25 s 8 5 3 Phase Sequencing The bus phases follow a prescribed sequence However the Reset Condition can abort any phase and force the bus to the Bus Free Phase The Phas...

Страница 86: ...Tandberg Data Hardware Interface ___________________________________________________________________________ 8 18 Tandberg SLR Reference Manual This Page Intentionally Left Blank...

Страница 87: ...Tandberg SLR Reference Manual 9 1 9 Software Interface 9 1 General Information The software interface description is contained in a separate manual available from our Marketing Department Tandberg SLR...

Страница 88: ...Tandberg Data Software Interface ___________________________________________________________________________ 9 2 Tandberg SLR Reference Manual This Page Intentionally Left Blank...

Страница 89: ...Exercise most of the drive s functionality without re quiring any cartridge to be inserted In default mode the test exer cises the drive s typical conditions of continuous read and writes without bei...

Страница 90: ...tions that are tested EEPROM Recognize Test Write Read test of dedicated Test Cells SCSI Controller Recognize Test Register Test Data Path Controller DPC Recognize Test Register Test DPC MAC Test Test...

Страница 91: ...a The user just attaches the jumpers and connects the power supply The fault coverage shall be fairly high considered the fact that there is no tape High coverage is achieved by running as many tests...

Страница 92: ...ous Mode SEL3 is defined as Continuous mode selector If SEL3 is enabled the test will be set up with infinite number of loops This means that the test runs forever or until a failure is observed if St...

Страница 93: ...pe50 SL SLR60 SLR75 SLR100 SLR40 60 100 10GB SLR140 SLR40 60 100 10GB Test Sequence The Diagnostic Cartridge test performs the following tests Collect Information Read and store Drive and Medium infor...

Страница 94: ...tton When the cartridge has been ejected the Eject Button must be pressed again for 6 seconds or more to get back to Service Mode 3 The Amber LED starts blinking slowly indicating the drive is in Serv...

Страница 95: ...ted No LED s will be lit the Cleaning LED may however be on Failure Indication When a failure has been detected the tape is not ejected and the amber Failure LED will be flashing Detailed information...

Страница 96: ...rom a SCSI Operated Diagnostics test can be retrieved by executing a RECEIVE DIAGNOSTC RESULTS command See the RECEIVE DIAGNOSTC RESULTS section in the Tandberg SLR7 SLR50 SLR60 SLR100 SLR140 SCSI Int...

Страница 97: ...k defines a diagnostic activity that the target shall perform Depending on the diagnostic activity Diagnostic Control Blocks can have different length BYTE BIT7 6 5 4 3 2 1 0 00 SSF SLF RAE PLV PreRev...

Страница 98: ...for each test started DACI M The DACI Marker DACI M bit specifies whether DACI Markers shall be transmitted or not 0 No DACI Markers 1 Transmit Activity Id in front of and Execute Status after each te...

Страница 99: ...CS command terminates with a Check Condition status The sense data returned by the REQUEST SENSE command will typically indicate a Hardware Error The Additional Sense Key and Additional Sense Key Qual...

Страница 100: ...uencer control bytes with the SPPL bit set to one and then a Sequence Identifier The sequencer control bytes byte 00 and byte 01 are described in the previous section BYTE BIT7 6 5 4 3 2 1 0 00 SSF SL...

Страница 101: ...Selftest Sequence offered by the SCSI Operated Diagnostics Starting the Test A DACI Operated Diagnostics operation is started by executing an Execute Diagnostics command Test Sequence See the Execute...

Страница 102: ...st covers the following parts 1 CPU Core Test This includes a sequence of Calculations Logical and Data Movement operations 2 System Integration Module SIM Register Test 3 General Purpose Timer GPT Te...

Страница 103: ...ent inserted tape from being damaged Capstan Motor Controller Ramp Test The test checks gentle and steep ramping functionality for both high and low tape speed 10 8 2 Cartridge Manipulation Test The C...

Страница 104: ...ll be terminated with a failure indication If no hard read or write error has occurred and the rereads and rewrites are within the specified limit no error is reported when the test completes Before s...

Страница 105: ...SLRtape24 SLR32 and SLRtape50 Write read on 3 partitions to cover all Head Elements Note that the GCR backward compatible head is only used for GCR formats used on SLR5 and DC9250 media and can not be...

Страница 106: ...None Hard Servo Errors None Soft Write Errors 2 4 per Ch Raw Read Error Rate 1 0 per Ch Soft Servo Errors TBD SLR32 Hard Write Errors None SLRtape24 Hard Read Errors None Hard Servo Errors None Soft...

Страница 107: ...ence and activity parameters Figure 10 1 illustrates the interface between users the Sequencer and the various selftest activities AID 1 AID 2 AID 3 AID 4 Jumper Diagnostic Tape SCSI DACI Sequencer Us...

Страница 108: ...Tandberg Data Selftest and Diagnostics ___________________________________________________________________________ 10 20 Tandberg SLR Reference Manual This Page Intentionally Left Blank...

Страница 109: ...ead immediately after using a new cartridge and if large numbers of re write or reread operations are performed The Head should also be immediately cleaned if hard Read or Write errors occur Use only...

Страница 110: ...Tandberg Data Preventive Maintenance ___________________________________________________________________________ 11 2 Tandberg SLR Reference Manual This Page Intentionally Left Blank...

Страница 111: ...test or initialization as a result of hardware errors It should be possible to read the Initialization Marker in RAM via DACI or the BDM connector The markers are transmitted via the DACI interface as...

Страница 112: ..._________________________________ A 2 Tandberg SLR Reference Manual A 2 Power on Selftest Codes Before executing the Selftest procedure the marker corresponding to the Selftest Number Activity ID is s...

Страница 113: ...the Drive there is a metal axle pin Use a pointed object e g a pen or a screwdriver to push the axle half an inch inwards Then push the bridge aside The Drive is now in stand by position Step B see Fi...

Страница 114: ...Tandberg Data Appendix B Manual Cartridge Eject ___________________________________________________________________________ B 2 Tandberg SLR Reference Manual This Page Intentionally Left Blank...

Страница 115: ...indicate fatal errors at an early power up stage This is accomplished by turning the LEDs ON one by one The Fault LED as early as possible after CPU initialization if this is the only LED lit it coul...

Страница 116: ...eted ready to restart the new code OFF ON OFF A fatal error has occurred The Drive must possibly be re initialized ON ON ON NOTE 1 Some of the states are difficult to see due to short duration C 3 LED...

Страница 117: ...rtridge Positions During Load Eject and Reset Prior to Load the cartridge will protrude 18 mm from the bezel front load force max 750 g After Eject the cartridge will protrude 27 5 mm from the bezel f...

Страница 118: ...Tandberg Data Appendix D Cartridge Positioning ___________________________________________________________________________ D 2 Tandberg SLR Reference Manual This Page Intentionally Left Blank...

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