Seagate Technology 10002475-003, Product Description Manual

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ATAPI Interface Chapter 5
Product Description Manual Page 39
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.
Code DSC
Restrictive Command Comments
00h Y TEST UNIT READY Not DSC restrictive on some other drives.
01h Y REWIND
03h N REQUEST SENSE Null status if DSC not set.
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 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 time. (All LOADS
imply REWIND and select partition 0.)
2Bh Y LOCATE Locates logically only; can also select partition.
34h Y READ POSITION Also used to wait for previous command done.
3Bh — WRITE BUFFER Use for download only. Drive must be "unloaded".
4Ch — LOG SELECT Resets Error Counts.
4Dh — LOG SENSE Contains Error Counts (WRITE and READ) and
tape capacity.
Reserved Fields
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.