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Product Description Manual

Page 61

Theory of Operations

Overview

The STT8000 ATAPI minicartridge drive is a low-cost, high-performance D2000
minicartridge tape drive that is ideal for stand-alone users or small network
computer systems. With capacities of 4.0 GB to 8.0 GB dependent upon media
and data compression, this drive offers quick, efficient backup and restore
operations. Its unique FastSense

TM

feature automatically selects the

appropriate transfer rate—600, 450, or 300 kb/sec—based on the speed of the
operating system.

The STT8000 ATAPI minicartridge drive is based on proven Seagate designs,
Seagate firmware, and the latest technology. This drive uses second
generation, custom LSIs for efficient circuit layout and increased reliability
with low power consumption. The drive also uses flash EEPROM devices for
easy firmware upgrades.

This chapter describes the drive in more detail and explains implementation
specific information.

Block Diagrams

The electronics of the STT8000 ATAPI minicartridge drive are laid out on one
main printed circuit board (PCB).

Figure 7-1 is a simplified block diagram of the drive.

Understanding the Drive

This section generally describes the hardware design features of the STT8000
ATAPI minicartridge drive. You may want to refer to the block diagrams
referenced previously as you read this information.

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Содержание 10002475-003

Страница 1: ...Seagate Technology STT8000 ATAPI Minicartridge Drive Product Description Manual July 1997 Part Number 10002475 003 Stocking Number 601 087 ...

Страница 2: ......

Страница 3: ...d receiver are on different branch circuits If necessary you should consult the dealer or an experienced radio television technician for additional suggestions You may find the following booklet prepared by the Federal Communications Commission helpful How to Identify and Resolve Radio TV Interference Problems This booklet Stock No 004 000 00345 4 is available from the U S Government Printing Offi...

Страница 4: ...o right is conveyed to reproduce or translate any item herein disclosed without express written permission from Seagate Technology Seagate Technology provides this manual as is without warranty of any kind either expressed or implied including but not limited to the implied warranties of merchantability and fitness for a particular purpose Seagate Technology reserves the right to change without no...

Страница 5: ...1 Tape Capacities and Formats 12 Regulatory Compliance 12 3 Installation 13 Introduction 13 Before You Begin 13 Check the Package Contents 13 Guidelines 14 Installation Summary Default 14 Installing the Seagate IDE Adapter Card 15 Installing the Drive Unit 17 Custom Installation with the Seagate IDE Adapter Card 23 Configuring the Seagate IDE Adapter Card 24 4 Drive Operations 27 Introduction 27 F...

Страница 6: ...Servo Pattern 58 Write Equalization 59 Randomization 59 7 Theory of Operations 61 Overview 61 Block Diagrams 61 Understanding the Drive 61 Mechanics 63 Cartridge Load Mechanism 63 Capstan Drive Motor Assembly 63 Chassis 63 Control Circuits 63 Head Design 64 Flash EEPROM 64 Sensors and Switches 64 Media Minicartridges 65 8 Maintenance Troubleshooting and Reliability 67 Maintenance 67 Caring for Tap...

Страница 7: ...Table of Contents Product Description Manual Page vii A Glossary 71 B Acronyms and Measurements 75 Acronyms and Abbreviations 75 Measurements 76 ...

Страница 8: ...Table of Contents Page viii STT8000 ATAPI Minicartridge Drive NOTES ...

Страница 9: ... on the specific system and the nature of the files being compressed This drive optimizes throughput through the Seagate feature FastSenseTM This feature enables the drive to automatically sense the fastest supportable data transfer rate of the host system and choose a transfer speed of either 600 450 or 300 kilobytes second KB sec This process maximizes system throughput by eliminating tape repos...

Страница 10: ...s and the growth of small networks the need for cost effective high capacity storage has grown The STT8000 ATAPI minicartridge drives are ideal for high end standalone computers workstations and small networks Built using long wearing materials and custom Large Scale Integration LSI components the ATAPI drive was engineered for heavy duty computer applications Providing carefully controlled tape h...

Страница 11: ...C 3080 standard z QIC 3095 MC tape format compliance for compatibility and information interchange z Typical uncompressed capacities of 4 gigabytes on 740 foot TR 4 media 2 gigabytes on 400 foot QIC Wide media 1 6 gigabytes on 400 foot quarter inch minicartridge media z Typical compressed capacities of 8 gigabytes on 740 foot TR 4 media 4 gigabytes on 400 foot QIC Wide media 3 2 gigabytes on 400 f...

Страница 12: ...s the master Figure 1 3 shows sample configurations for ATAPI systems Figure 1 3 Sample ATAPI Configurations COMPUTER SYSTEM HARD DISK PRIMARY IDE BUS SECONDARY IDE BUS ENHANCED IDE CONTROLLER COMPUTER SYSTEM HARD DISK STT8000 ENHANCED IDE CONTROLLER CD ROM MASTER STT8000 SLAVE ACCULOGIC IDE ADAPTER Minicartridge Technology Overview Having evolved from the original mass storage medium reel to reel...

Страница 13: ...ecorded The individual tracks are sequential to minimize the amount of head motion as the heads change position for each track Flash EEPROM The STT8000 ATAPI minicartridge drive incorporates leading edge technology in the flash EEPROM which is useful should the drive s firmware need to be upgraded at some point With the permanently installed electrically upgradeable flash EEPROM memory revised fir...

Страница 14: ...ly described in the following table A glossary of terms is also included Number Title Description 2 Specifications Contains physical performance environmental power and minicartridge specification tables 3 Installation Provides cautions unpacking tips inspection information and installation connection steps including cabling requirements and connector pinouts 4 Drive Operation Explains the simple ...

Страница 15: ...d tapes z Tape capacities and formats z Regulatory compliance Physical Specifications The physical specifications of the STT8000 ATAPI minicartridge drive are listed in the following table Specification Drive for 3 5 Inch Mount Drive for 5 25 Inch Mount Height 1 0 in 25 mm 1 7 in 43 mm Width 4 0 in 102 mm 5 87 in 149 1 mm Length 6 2 in 157 5 mm 6 36 in 161 5 mm Weight 1 0 lbs 0 5 kg 1 5 lbs 0 7 kg...

Страница 16: ...rtridge drive 3 5 Inch mount general dimensions 6 19 157 2mm 4 00 101 6mm 4 00 101 6mm DRIVE ACTIVE AMBER 1 00 25 4mm 0 157 4mm Figure 2 2 STT8000 IDE minicartridge drive 5 25 Inch mount general dimensions 1 685 42 8mm 5 87 149 0mm 0 20 5 0mm 0 86 21 8mm 5 76 146 4mm 5 49 139 4mm DRIVE ACTIVE GREEN ...

Страница 17: ...are nominal values Specification Measurement DC Voltage 12 VDC 5 VDC Voltage Tolerance or 10 or 5 Operational Current 2 0 amps 1 0 amp Standby Current 0 2 amp 0 6 amp Peak 2 2 amps max Power Sequence None None Ripple peak to peak 100 mV 100 mV Power use nominal 15 Watts excluding surge 15 Watts excluding surge The following table lists pin assignments for the power connector for the drive Pin Assi...

Страница 18: ...essed Data transfer rate 300 450 600 KB second FastSense Tape speed Read Write Search Rewind 33 51 or 77 ips 90 ips maximum Recording method Serpentine Recording format QIC 3095 MC Recording code 1 7 RLL Error recovery Reed Solomon ECC Recording unrecoverable errors Less than 1 in 1015 data bits Head configuration Wide write narrow read Recording media 900 Oe 740 Travan TR 4 Cartridge size 3 2 in ...

Страница 19: ...k to Peak Displacement 0 005 max 5 to 44 3 Hz 0 1 max 5 to 17 Hz Peak Acceleration 0 50 g max 44 3 to 500 Hz 1 5 g max 17 to 500 Hz Acoustic level operational A wt sum 55 dBA maximum measured in suitable enclosure at 3 ft distance and operator height Shock 1 2 sine wave 2 5 g s peak 11 msec 100 g s peak 11 msec 1Mechanism and media 2Mechanism Recommended Tapes The STT8000 ATAPI minicartridge drive...

Страница 20: ...ation CSA C22 2 No 950 M89 TUV IEC RHEINLAND EN 60 950 IEC 950 UL 1950 Canadian Dept of Communications Class B VDE Class B FCC Class B Part 15 Use the STT8000 ATAPI minicartridge drives only in equipment where the combination has been determined to be suitable by an appropriate certification organization for example Underwriters Laboratories Inc or the Canadian Standards Association in North Ameri...

Страница 21: ... Seagate IDE Adapter card describes the steps to take to install the adapter card z Installing the Drive Unit explains how to mount the internal drive unit z Custom Installation explains the various IRQ settings that you might need to make to resolve conflicts z Configuring the Seagate IDE Adapter card explains how to configure the card for custom installations Before You Begin Check the Package C...

Страница 22: ...to discharge any static electricity buildup from your body Caution If you touch static sensitive parts of the drive such as the printed circuit board or if you touch any of the components on the adapter card and discharge static electricity the components may be damaged z Hold the drive and the adapter card by the edges only Avoid direct contact with any printed circuit board exposed in the drive ...

Страница 23: ...e to your equipment or electrical shock to you Note Because computer models vary between manufacturers refer to your computer manual for specific instructions about installing additional boards 1 Remove the cover from your computer Refer to the manual that you received with your computer for instructions about removing the computer cover 2 Choose an available 16 bit ISA expansion slot within your ...

Страница 24: ...apter card appears to be too short for connection in your computer DO NOT SUBSTITUTE A LONGER CABLE If necessary move the other cards in the computer to different slots until the cable supplied with the ATAPI card reach the tape device Figure 3 2 Inserting the Interface Card in the Expansion Slot 5 Connect the connector on one end of the interface cable with the connector on the adapter card See F...

Страница 25: ...izontally LED to the left and vertically LED up or down The following section provides directions for mounting the drive in either a 3 5 inch enclosure or in a 5 25 inch enclosure 1 Write down the serial number and model number shown on the drive and put this information in a safe place You need this information if you ever call for service 2 With the computer cover removed remove the face plate f...

Страница 26: ...face plate are flush Then align the mounting holes as shown in Figure 3 4 Figure 3 4 Aligning the Drive in the Computer 6 Secure the drive using the mounting screws The threaded mounting brackets are designed for M3 0 metric screws If you are mounting the drive in a 3 5 inch bay use the screw supplied with the drive Do not substitute other screws because use of longer length screws may damage the ...

Страница 27: ...ct Description Manual Page 19 Figure 3 5 Mounting Holes on Internal Drive 6 2 in 158mm 2 382 in 60mm 984 in 25mm 3 543 in 90mm 2 758 in 70mm 1 220 in 31mm 0 315 in 8mm 0 2 in 5mm 157 in 4mm 1 0 in 25 4mm 3 7 in 94mm 4 0 in 102 6mm ...

Страница 28: ...0 86 in 21 8mm 075 in 1 9mm 2 PLACES 5 87 in 149 0mm 5 76 in 146 4mm 7 Check the jumper block to ensure that the jumper is properly configured for your system Figure 3 7 shows the location of the jumper block Figure 3 8 shows the jumper block The default setting is Slave mode with a jumper over pin 3 and pin 4 Your individual system setting may vary so be sure to check your computer or ATAPI contr...

Страница 29: ...n available power cable to the power connector on the drive Figure 3 7 shows the location of the power connector The recommended power mating connector requires an AMP 1 48024 0 housing with AMP 60617 1 pins or equivalent Note Turn off all power before inserting connectors 9 Connect the interface cable with the connector on the rear of the unit When you make the connection be sure pin 1 of the con...

Страница 30: ...lowing table for your reference Pin Assignment Description Source 1 RESET Reset Host 2 Gnd Ground N A 3 DD7 Data Bus bit 7 Host Device 4 DD8 Data Bus bit 8 Host Device 5 DD6 Data Bus bit 66 Host Device 6 DD9 Data Bus bit 9 Host Device 7 DD5 Data Bus bit 6 Host Device 8 DD10 Data Bus bit 10 Host Devicee 9 DD4 Data Bus bit 4 Host Device 10 DD11 Data Bus bit 11 Host Device 11 DD3 Data Bus bit 3 Host ...

Страница 31: ...Q level 15 and I O address 170h Depending on the configuration of your system including the type of peripherals and the motherboard a custom installation will be necessary if a conflict exists with the factory default settings of the adapter card and the software This section describes the steps to take to set up the correct IRQ and address settings if a conflict occurs 1 Run the DOS Version 5 0 o...

Страница 32: ...en power up the computer You must also make the corresponding change to the configuration in the Seagate Backup software Run the hardware test process until a working combination is found Notes Because the Seagate Backup software controls the drive directly through the adapter card you do not need to install any device drivers Some mother boards contain two onboard ATAPI interfaces One such interf...

Страница 33: ...ernate jumper settings Choose an alternate setting that does not conflict with other devices within your computer To change a setting pull the jumper from its current position and slide it onto the desired position Figure 3 10 Jumper Configurations JP2 JP3 JP4 JP2 JP3 JP4 JP2 JP3 JP4 JP2 JP3 JP4 DISABLED 170 177 1E8 1EF 168 16F I O ADDRESS IRQ15 DEFAULT IRQ10 IRQ11 IRQ CHANNEL IRQ12 ...

Страница 34: ...Chapter 3 Installation Page 26 STT8000 ATAPI Minicartridge Drive Notes ...

Страница 35: ...s z Loading revised firmware updating flash EEPROM Note Required drive maintenance is explained in chapter 8 Front Panel LED Operation The front panel of the Travan drive contains the cartridge opening and one amber light emitting diode LED This LED is lit when the tape is NOT at the beginning of the tape Thus the LED shows tape movement when lit Figure 4 1 shows the front panel of the internal dr...

Страница 36: ...overs the cartridge opening when a tape cartridge is not installed in the drive Once a cartridge is inserted it is held firmly in place by the drive s positive locking mechanism Caution DO NOT remove a tape cartridge while the drive is active Complete any tape operations and wait until the amber LED is OFF before removing the cartridge To load a cartridge insert it with the metal base plate down a...

Страница 37: ...Setting the Write Protect Switch Travan minicartridges feature a sliding write protect tab located in the upper left corner of the cartridge You can set the tab to keep data from being written on the tape Use this switch when you want to make sure that important data on the tape will not be overwritten Figure 4 4 shows the cartridge with the switch in the nonprotected read write or unlocked positi...

Страница 38: ...m and the STT8000 drive Allow the system boot up process to reach the point where there is no ATAPI bus activity 2 Place the firmware upgrade cartridge record switch to the nonrecord position Insert the firmware upgrade cartridge in the drive and observe the amber LED light on the front of the drive 3 Once the upgrade cartridge is inserted tape motion begins The drive LED flashes on and off Approx...

Страница 39: ...ed correctly and the drive may not operate properly If a problem occurs during the firmware loading process the LED on the front panel goes out In that case the firmware upgrade cartridge may be defective or the drive may not be operating correctly If after a repeat loading of the firmware cartridge the same condition is observed contact your Seagate sales representative Firmware upgrade cartridge...

Страница 40: ...Chapter 4 Drive Operations Page 32 STT8000 ATAPI Minicartridge Drive Notes ...

Страница 41: ... clarifies the use of several ATA 2 signals and ATAPI commands that are either vague or optional in the QIC 157 specification ATA 2 Interface The information about the ATA 2 interface is presented in the following topics ATA 2 Signals ATA Registers and ATA Commands ATA 2 Signals Only the DASP and PDIAG signals are described in the following paragraphs DASP This signal is used during power up hands...

Страница 42: ...yte Count High EBh EBh EBh EBh EBh Drive Head 00 00 00 During an ATA soft reset or aborted ATA command the host view of the DSC bit Status register will be cleared along with the DRDY bit Any ATAPI command including ATAPI Identify can be used to set DRDY true and to re enable host view of DSC bit Status Register The following layout represents the Status Register 7 6 5 4 3 2 1 0 BSY DRDY 0 DSC DRQ...

Страница 43: ...detected On a WRITE command unrecover able data might be left in the buffer 0 ILI Illegal Length Indication This bit is set when an illegal length block is read Sense Status also indicates ILI Feature Register The following layout represents the Feature Register 7 6 5 4 3 2 1 0 DMA Bit Mnemonic Description 0 DMA DMA Data Transfer When this bit is a 1 the data transfer is in DMA mode If the bit is ...

Страница 44: ...o Idle and to generate an interrupt Although the drive has no actual power saving features this command is emulated for software compatibility Standby Immediate E0h This command causes the device to set its Power Mode state to Standby and to generate an interrupt Although the drive has no actual power saving features this command is emulated for software compatibility Check Power Mode E5h This com...

Страница 45: ...fer Mode 0 09h PIO Transfer Mode 1 0Ah PIO Transfer Mode 2 10h Single Word DMA Mode 0 11h Single Word DMA Mode 1 12h Single Word DMA Mode 2 Issuing PIO and DMA transfer modes does not actually select these operations however issuing these modes selects the rate of either type of transfer as selected by the DMA bit bit 0 of the ATAPI Features register Note PIO Mode 3 is not supported and IORDY hand...

Страница 46: ...s 0000h Unsupported 57 58 Current Capacity 0000h Unsupported 59 Reserved 0000h 60 61 User Addressable Sectors 0000h Unsupported 62 Single Word DMA Mode 0407h Selected DMA mode 2 Upper Byte DMA modes 2 1 0 Supported 63 Multi Word DMA Mode 0407h Selected DMA mode 2 Upper Byte DMA modes 2 1 0 supported 64 Enhanced PIO Mode 0003h PIO Mode 3 and 4 Supported 65 Minimum Multi Word DMA Cycle Time 0078h Mo...

Страница 47: ...ired to initialize DSC 10h Y WRITE FILEMARK Flush always WFM 0 to flush 11h Y SPACE Space forward reverse Filemarks and space to EOD only 12h N INQUIRY DSC not affected 15h MODE SELECT Select speed FDP page 2B updates only 19h Y ERASE Constitutes a logical erase accepted at BOP0 1 or EOD only 1Ah MODE SENSE 1Bh Y LOAD UNLOAD UNLOAD to make not ready LOAD to return to Ready LOAD w Retension any tim...

Страница 48: ...ld Erase at EOD is accepted but no operation is performed except a write flush if following a WRITE command This result is because all data following EOD is already logically erased The DSC bit is reset 0 after this command is accepted and is set 1 when the command is complete REQUEST SENSE can then be used to verify successful command completion Inquiry Bit Byte 7 6 5 4 3 2 1 0 0 Operation code 1...

Страница 49: ...drive only through the ATAPI protocol Load Unload Bit Byte 7 6 5 4 3 2 1 0 0 Operation code 1Bh 1 Reserved 2 Reserved 3 Reserved 4 Reserved Re Ten Load 5 Reserved LOAD with or without Retension is accepted any time a tape is present in the drive even if status indicates it is already loaded This command includes implicit rewind and select partition 0 operations The DSC bit is reset 0 after this co...

Страница 50: ...to Block 0 might or might not report a Blank Check error The DSC bit is reset 0 after this command is accepted and is set 1 when completed REQUEST SENSE can then be used to verify successful command completion Log Select Bit Byte 7 6 5 4 3 2 1 0 0 Operation code 4Ch 1 Reserved PCR Reserved 2 01 PC Reserved 3 Reserved 4 Reserved 5 Reserved 6 Reserved 7 MSB Parameter List Length 8 LSB 9 Reserved The...

Страница 51: ... data is being requested The Parameter Pointer field allows requested parameter data to begin from a specific parameter code The Allocation Length field specifies the number of data bytes to transfer The following table presents the supported log pages Byte Description Value Meaning 0 Page Code 00h Supported Log Pages Page 1 Reserved 00h 2 3 Page Length 00 04h 4 Supported Pages 4 First Supported P...

Страница 52: ... ECC Corrections N N N N Counter Value 36 37 Parameter Code 8022h Even Tracks Read Retries Code 38 Parameter Bits 40h Device Controlled Counter 39 Parameter Length 04h 4 byte Counter 40 43 Even Tracks reverse Read Retries N N N N Counter Value 44 45 Parameter Code 8023h Odd Tracks Read Retries Code 46 Parameter Bits 40h Device Controlled Counter 47 Parameter Length 04h 4 byte Counter 48 51 Odd Tra...

Страница 53: ...angable parameters are Speed Selection in the Mode Parameter Header and certain fields in Mode Page 2Bh MFM mode The Parameter List Length field specifies the length in bytes of the Mode Select parameter list that are transferred to the device as data A Parameter List Length of zero indicates that no data is transferred Mode Sense should be issued prior to Mode Select to determine the supported pa...

Страница 54: ...echanical Status Page 2Bh Tape Parameters Page MFM mode 3Fh Return All Pages Mode Parameter Header The following table describes the Mode Parameter header Byte Description Value Meaning 0 Mode Data Length NN Select Reserved Sense Length of Available Following Data 1 Medium Type NN Tape type 2 Device Specific Parameters WP 001 Speed Bit 7 Write Protect Bits 6 4 001 Bits 3 0 Speed Selection 3 Block ...

Страница 55: ...dditional Partitions Additional Partitions Defined 00h 00h Not Supported 4 FDP bit 7 reserved 80h Fixed Data Partitions 5 Medium Format Recognition 03h Format and Partition Recognition 6 7 Reserved 00h 00h None of the Medium Partition Page 11h parameters can be changed Mode Capabilities and Mechanical Status Page The following table describes the Mode Capabilities and Mechanical Status Page layout...

Страница 56: ... is used for MFM Modified Frequency Modulation or floppy interface tape formats such as 2080 2120 TR1 TR2 TR3 etc The drive supports the reading of MFM tapes but does not support write or format operations on MFM tapes The following fields are changeable SEGTRK TRKS MAXCYL and MAXHD Read Bit Byte 7 6 5 4 3 2 1 0 0 Operation code 08h 1 Reserved 1 Fixed 2 MSB 3 Transfer Length 4 LSB 5 Reserved The T...

Страница 57: ...NNNNN Not Supported 12 Reserved 00h 13 15 Blocks in Buffer 000000 Not Supported 16 19 Bytes in Buffer 00000000 Not Supported These fields might appear to report the number of bytes blocks in the buffer However this information is not guaranteed to be accurate You should not rely on this information The only position that is guaranteed is the host logical block position The First and Last Block Loc...

Страница 58: ...the next command issued if not Request Sense or Inquiry will be aborted and a deferred error will be reported If the command is Request Sense a non deferred error is reported The Inquiry command does not affect status reporting The following table describes the REQUEST SENSE layout Byte Description Value Meaning 0 Valid Error Code 70h 71h 80h Information Field Valid 70h Current Errors or 71h Defer...

Страница 59: ...ive is ready to write at BOP0 or encountered a hardware error REQUEST SENSE can then be used to verify successful command completion Space Bit Byte 7 6 5 4 3 2 1 0 0 Operation code 11h 1 Reserved Space Code 2 MSB 3 Count 4 LSB 5 Reserved The only Space codes that are supported are 001b Filemarks and 011b End of Data on Current Partition For Space Filemarks negative count 2s compliment indicates Sp...

Страница 60: ...Ready does not wait for DSC set before completing and if an application needs to wait for an command done via the ATAPI interface Read Position should be used instead Write Bit Byte 7 6 5 4 3 2 1 0 0 Operation code 0Ah 1 Reserved 1 Fixed 1 Reserved 2 MSB 3 Transfer Length 4 LSB 5 Reserved The Transfer Length specifies the number of fixed 512 byte blocks to be transferred A transfer length of 0 ind...

Страница 61: ...and is accepted The DSC bit is set 1 after the EOD has been successfully written REQUEST SENSE can then be used to verify successful command completion Write Buffer Download Microcode Bit Byte 7 6 5 4 3 2 1 0 0 Operation code 3Bh 1 Reserved 101 Mode 2 Reserved 3 Reserved 4 Reserved 5 Reserved 6 MSB 7 Transfer Length 8 LSB 9 Reserved The Write Buffer command is intended only to provide a method for...

Страница 62: ...Chapter 5 ATAPI Interface Page 54 STT8000 ATAPI Minicartridge Drive Notes ...

Страница 63: ...the data partition of one 900 foot long 0 315 inch 8 0 mm wide Travan TR 4 tape Using software data compression these capabilities are typically doubled The recording format and partitioning support Quick File Access QFA Track Positions The centermost track is called the Directory Track and has larger guard bands on both sides of it to allow it to be written without interfering with its adjacent t...

Страница 64: ...nts z Logical numbering does not relate to the blocks physically recorded on the tape rather this type of numbering is the block numbering system used by the host computer Often the host system operates with logical blocks that are a different size from the 512 byte blocks that are physically recorded on the tape The host blocks can be larger or smaller than 512 bytes and can also be fixed or vari...

Страница 65: ... is rewritten in its entirety at the beginning of the following track Frames are not split around corner turns The general frame layout 52 data blocks and 12 ECC blocks is illustrated in Figure 6 2 Figure 6 2 General Frame Layout Data Block Data Data Data Block Block Block 0 1 2 51 ECC ECC Block Block 0 11 The four types of frames are as follows z Data frames contain data and information blocks in...

Страница 66: ...rmation blocks Filemark blocks Setmark blocks and Cancelmark blocks contain specific types of information Filemark blocks are physical blocks written to tape in response to a host WRITE FILEMARKS command Setmark blocks are physical blocks written to tape in response to a host WRITE SETMARKS command Cancelmark blocks are physical blocks written to tape under firmware control z Filler blocks contain...

Страница 67: ...nt improvement in read back resolution On 900 Oersted media write equalization provides the benefit of compatibility with Magneto Resistive MR heads MR heads are prone to saturation by low frequency flux with high energy content Equalization redistributes this energy to higher frequencies and eliminates the problem Randomization To reduce problems resulting from long strings of repetitive data wit...

Страница 68: ...Chapter 6 Tape Format Page 60 STT8000 ATAPI Minicartridge Drive Notes ...

Страница 69: ...based on proven Seagate designs Seagate firmware and the latest technology This drive uses second generation custom LSIs for efficient circuit layout and increased reliability with low power consumption The drive also uses flash EEPROM devices for easy firmware upgrades This chapter describes the drive in more detail and explains implementation specific information Block Diagrams The electronics o...

Страница 70: ...PER DRIVE MOTOR IDE CONTROLLER CONTROL LOGIC TAPE HEAD WRITE DRIVER READ CHANNEL MICRO PROCESSOR SYSTEM CLOCK Table 7 1 Clock Frequencies used by the STT8000 Drive VCO Frequencies All Derived from System Clock 42 MHz Crystal Oscillator Fundamental Frequency 28 MHz 28 MHz 28 MHz 24 89 MHz Channel Frequency 9 33 MHz 7 00 MHz 4 667 MHz 3 11 MHz ...

Страница 71: ...ear slide The cartridge is loaded against the cartridge drive roller which exerts a net radial dynamic force of 18 to 26 ounces The motor is a brushless DC drive motor with integral capstan which is designed to provide maximum reliability The motor operates from the 12V nominal supply and moves the tape at speeds from 35 to 100 inches per second IPS Chassis The drive mechanism is mounted in a mold...

Страница 72: ...stable performance throughout the life of the drive Flash EEPROM Because the drive uses flash EEPROM electronically erasable programmable read only memory the drive firmware can be easily upgraded when new revisions of the firmware are released The circuitry includes 128 KB of flash EEPROM You can load new firmware by using a specially encoded firmware upgrade cartridge Refer to chapter 4 for info...

Страница 73: ...Ferric Oxide magnetic tape Figure 7 2 shows a Travan minicartridge Figure 7 2 Travan Minicartridge The cartridge also provides for write protection so that existing data on the cartridge is not overwritten A write protected cartridge allows the existing data to be read but does not allow new data to be written to the tape The position of the sliding write protect tab on the cartridge determines wh...

Страница 74: ...Chapter 7 Theory of Operations Page 66 STT8000 ATAPI Minicartridge Drive NOTES ...

Страница 75: ...f electromagnetic fields such as telephones dictation equipment mechanical or printing calculators motors and bulk erasers Do not lay cartridges on the computer monitor or on the base unit of the computer z Keep the cartridge away from direct sunlight and heat sources such as radiators or warm air ducts z Keep the cartridge free of moisture Do not wet or submerge a cartridge in any liquid z Do not...

Страница 76: ...10001794 001 which is available through Seagate Express 1 800 531 0968 or you can manually clean the drive head To manually clean the drive head follow these steps 1 Moisten a clean lint free swab in 90 isopropyl alcohol so that it is wet but not dripping Never use a dry swab 2 Hold the drive access door open and wipe the head gently using a side to side motion The upright rectangle with the strip...

Страница 77: ...the cartridge and try again Make sure you are using the correct type of tape cartridge 2 Turn off all power to the computer and drive Wait for the computer to power down and then start over 3 Try a different tape preferably one that has never been used 4 Check all cable connections for proper contact 5 Clean the tape drive head as previously instructed Then try the operation again 6 Check to be su...

Страница 78: ...des maintenance periods Operational time is assumed to be 20 of the power on time Operational time is the time the tape is loaded Note Seagate does not warrant the stated MTBF as representative of any particular unit installed for customer use The failure rate quoted here is derived from a large database of test samples Actual rates may vary from unit to unit Mean Time To Repair The Mean Time To R...

Страница 79: ...inning of the permissible recording region of a partition BOT marker The beginning of tape BOT marker is a set of two holes punched side by side in the tape Byte A group of 8 binary bits operated on as a unit Cancelmark A negative Filemark or Setmark When a Cancelmark follows as the first block in the next frame after a Filemark or Setmark the drive when reading the tape will logically ignore the ...

Страница 80: ...f the permissible recording area of a partition End of Tape EOT Equal to the logical end of the tape Error Correction Codes ECC nformation written on tape during the recording operation that can later be used to reconstruct errors during the data reading operation Early Warning EW The early warning marker is a single hole punched in the tape to indicate the approaching end of the usable recording ...

Страница 81: ...recording method in which tracks are laid down sequentially and the tape is not rewound at the end of a track This recording method exploits the bidirectional capabilities of the cartridge Streaming A method of recording on magnetic tape that maintains continuous tape motion without the requirement to start and stop within an interblock gap Tape Drive A peripheral storage device that records data ...

Страница 82: ...Appendix A Glossary Page 74 STT8000 ATAPI Minicartridge Drive Notes ...

Страница 83: ...ble Programmable Read Only Memory EOD End of Data EOM End of Media EOT End Of Tape FCC Federal Communications Commission FTPI Flux Transitions Per Inch IDE Intelligent Drive Electronics IEC International Electrotechnical Commission IPS Inches Per Second LED Light Emitting Diode LSI Large Scale Integration MTBF Mean Times Between Failures MTTR Mean Time To Repair OEM Original Equipment Manufacturer...

Страница 84: ... weighted sound power reference one picowatt F Fahrenheit ft foot or feet g acceleration of a free falling body equal to 32 17 feet per second2 GB gigabyte Hz Hertz in inch k kilo KB kilobyte kg kilogram KHz kilohertz lb s pound s m meter M mega Mbits megabits MB megabyte MHz megaHertz min minute mm millimeter ms millisecond RPM revolutions per minute V Volt W Watt ...

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