6.Command Specification
SONY AIT-E Turbo drive SDX-250V series Ver.1.0
6-1
6. Command Specification
This clause includes all supported and unsupported SCSI commands. Elements of this clause come from clauses 7,
8 and 9 of the ANSI X3T9.2, SCSI interface specification.
There are different types of SCSI commands, each with a specific, required length (in bytes.) The majority of the
commands are 6 byte Group 0 commands. Group 1 & 2 commands are 10 bytes long. Note that the drive will wait
until the required number of bytes are transferred. At the termination of each command, the target sends a status
byte to the initiator. See the clause on Status for more details. The following is a list of the supported SCSI
Commands and page index:
Table 6-1: SCSI Commands and Page Index
PARA
SCSI COMMAND
OP CODE
PAGE
6.1 ERASE
19h
6-2
6.2 INQUIRY
12h
6-3
6.3 LOAD
/UNLOAD
1Bh
6-8
6.4 LOCATE
2Bh
6-9
6.5 LOG
SELECT
4Ch
6-10
6.6
LOG SENSE 4Dh
4Dh
6-12
6.7 MODE
SELECT(6)
15h
6-26
6.8 MODE
SENSE(6)
1Ah
6-41
6.9
PERSISTENT RESERVE IN
5Eh
6-44
6.10
PERSISTENT RESERVE OUT
5Fh
6-48
6.11
PREVENT ALLOW MEDIUM REMOVAL
1Eh
6-50
6.12 READ
08h
6-51
6.13
READ BLOCK LIMITS
05h
6-53
6.14 READ
BUFFER
3Ch
6-54
6.15 READ
POSITION
34h
6-56
6.16
RECEIVE DIAGNOSTIC RESULTS
1Ch
6-58
6.17 RELEASE
UNIT
17h
6-60
6.18
REPORT DENSITY SUPPORT
44h
6-61
6.19 REPORT
LUNS
A0h
6-63
6.20
REQUEST BLOCK ADDRESS
02h
6-64
6.21 REQUEST
SENSE
03h
6-65
6.22 RESERVE
UNIT
16h
6-73
6.23 REWIND
01h
6-74
6.24 SEEK
BLOCK
0Ch
6-75
6.25 SEND
DIAGNOSTIC
1Dh
6-76
6.26 SPACE
11h
6-78
6.27
TEST UNIT READY
00h
6-81
6.28 VERIFY
13h
6-82
6.29 WRITE
0Ah
6-84
6.30 WRITE
BUFFER
3Bh
6-86
6.31 WRITE
FILEMARKS
10h
6-88
Note:
In compliance with the SCSI specification, the unit will terminate the command with a CHECK CONDITION
status and the sense key will be set to ILLEGAL REQUEST when a reserved bit, byte, field or code is not ZERO.
The unit has an embedded SCSI controller interface and therefore is a single target, single logical unit device when
on the SCSI bus. The Logical Unit Number for the drive is fixed and is set to ZERO. In order to be SCSI-2
compatible, the following scheme is used to check the LUN:
SCSI-2 states that the LUN addressed by the host should appear in the IDENTIFY message sent to the target on
selection. If SDX-250V receives an IDENTIFY message with a LUNTRN field of ZERO, then it will not check the LUN
field in the CDB (ANSI have reserved the right to reclaim the LUN field in the CDB in the next release of SCSI and
has recommended that this field not be used in SCSI-2 compatible devices). However, SCSI-1 and SCSI-2 devices
are allowed to coexist on the same bus, and SCSI-1 hosts will not send an IDENTIFY message. If SDX-250V does
NOT receive an IDENTIFY message on selection then it WILL check the LUN field in the CDB and expect it to be
ZERO. If it isn’t the unit will return a CHECK CONDITION status with an ILLEGAL REQUEST sense key set.
