Seagate STT8000A manual Atapi interface, Dsc

Page 46

Chapter 5

ATAPI Interface

ATAPI interface

The following table lists the ATAPI interface commands for the drive. In this table, DSC restrictive means that the host should wait for DSC to be set before issuing the command for minimum IDE bus overhead. Note that all ATAPI commands are 12 bytes in length. The command descriptions show only the first 6 or 10 bytes of these commands, even though the commands are actually 12 bytes long.

Note. Unless otherwise stated, all reserved and unsupported fields are not verified when the drive accepts a command. These fields are filled with 00s for future compatibility.

Code

DSC

Command

Comments

 

Restrictive

 

 

 

 

 

 

00h

Y

TEST UNIT

Not DSC restrictive on some other drives.

 

 

READY

 

 

 

 

 

01h

Y

REWIND

 

 

 

 

 

03h

N

REQUEST

Null status if DSC not set.

 

 

SENSE

 

 

 

 

 

08h

buffer

READ

Delay occurs if first READ is not READ 0 blocks.

 

 

 

 

0Ah

buffer

WRITE

Write 0 not required to initialize DSC.

 

 

 

 

10h

Y

WRITE

Flush always. WFM 0 to flush.

 

 

FILEMARK

 

 

 

 

 

11h

Y

SPACE

Space forward/reverse Filemarks and space to

 

 

 

EOD only.

 

 

 

 

12h

N

INQUIRY

DSC not affected.

 

 

 

 

15h

—

MODE

Select speed, FDP, page 2B updates only.

 

 

SELECT

 

 

 

 

 

19h

Y

ERASE

Constitutes a logical erase; accepted at BOP0/1

 

 

 

or EOD only.

 

 

 

 

1Ah

—

MODE

 

 

 

SENSE

 

 

 

 

 

1Bh

Y

LOAD/UNL

UNLOAD to make not ready; LOAD to return to

 

 

OAD

Ready. LOAD w/Retension any time. (All LOADS

 

 

 

imply REWIND and select partition 0.)

 

 

 

 

2Bh

Y

LOCATE

Locates logically only; can also select partition.

 

 

 

 

34h

Y

READ

Also used to wait for previous command done.

 

 

POSITION

 

 

 

 

 

3Bh

—

WRITE

Use for download only. Drive must be "unloaded".

 

 

BUFFER

 

 

 

 

 

4Ch

—

LOG

Resets Error Counts.

 

 

SELECT

 

 

 

 

 

4Dh

—

LOG

Contains Error Counts (WRITE and READ) and

 

 

SENSE

tape capacity.

 

 

 

 

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STT8000A Product Manual

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Contents STT8000A Atapi Minicartridge Drive Product Manual Page FCC Notice Important Information About This Manual Table of Contents Atapi interface Tape format Glossary Acronyms and measurements Introduction Drive overviewSTT8000A internal drive without mounting brackets Features Typical system configurations Minicartridge technology overviewSoftware Flash EepromReferences About this manual Chapter Title DescriptionPhysical specifications SpecificationsOverview STT8000A 3.5-Inch mount general dimensions Power specifications Specification MeasurementPerformance specifications Feature SpecificationSpecification Operational Non-operational Environmental requirementsMean-Time-Between Failures ReliabilityMean-Time-To-Repair Recommended tapes Tape capacities and formatsRegulatory compliance TUV & IEC-RHEINLANDBefore you begin InstallationIntroduction Handling guidelinesSetting jumpers Jumper block and jumper settingsInstalling the drive Aligning the drive in the computerMounting dimensions Mounting holes on internal drive without mounting brackets ATA-2 Interface pin assignments Pin Assignment Description SourceREQ Chapter Installation Drive operation and maintenance Front panel LEDUsing Travan cartridges Loading and unloading cartridgesSetting the write-protect switch Travan cartridge write-protect switch-locked positionLoading revised firmware via Seagate firmware cartridge Caring for tape cartridges Care and maintenance of the drive and cartridgesCaring for the drive Capstan Tape Head Troubleshooting Chapter Atapi interface ATA-2 SignalsATA-2 Interface ATA registers AbrtBits Mnemonic Description Supported ATA Commands Previous Cmd Int ReasonFeature Number Set Feature Commands Atapi Identify Device A1h Atapi Packet Command A0h Atapi interface DSCErase command Inquiry command Bit ByteLoad/Unload command Locate command Log Select command Log Sense command Error Counter Page Read Following table presents the Error Counter Page layoutTape Capacity Page Code Following table presents the Tape Capacity Page layoutMode Select command Mode Sense command Code DescriptionMode Parameter Header Mode Block DescriptorMode Medium Partition Mode Capabilities and Mechanical StatusMode Tape Parameters Read command Read Position command Following table describes the Read Position layoutChapter Atapi Interface Request Sense command Following table describes the Request Sense layout Rewind command Space command Test Unit Ready command Write command Write Filemark command Write Buffer download microcode command Tape partitioning Tape formatTrack positions Track format Track numberingFrames General track layout Tape reference servo pattern BlocksWrite equalization RandomizationChapter Tape format Block diagram Theory of operationsCartridge load mechanism Capstan drive motor assemblyMechanics ChassisControl circuits Sensors and switchesHead design Media-Travan minicartridges Travan minicartridgeGlossary Appendix a Glossary Glossary Appendix a Glossary Acronyms and measurements Acronyms and abbreviationsLSI Units of measurement Measure MeaningAppendix B Acronyms and Measurements
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