User Manual

SCSI Commands Reference Manual, Rev. J 39
www.seagate.com General Concepts
Table 4 Typical CDB for 12-byte commands
Bit
Byte
7 6 5 4 3 2 1 0
0
OPERATION CODE
1
Miscellaneous CDB information SERVICE ACTION (if required)
2
(MSB)
LOGICAL BLOCK ADDRESS (if required)
. . .
5
(LSB)
6
(MSB)
TRANSFER LENGTH (If required)
PARAMETER LIST LENGTH (if required)
ALLOCATION LENGTH (if required)
. . .
9
(LSB)
10
Miscellaneous CDB information
11
CONTROL
Table 5 Typical CDB for long LBA 16-byte commands
Bit
Byte
7 6 5 4 3 2 1 0
0
OPERATION CODE
1
Miscellaneous CDB information
2
(MSB)
LOGICAL BLOCK ADDRESS
. . .
9
(LSB)
10
(MSB)
TRANSFER LENGTH (If required)
PARAMETER LIST LENGTH (if required)
ALLOCATION LENGTH (if required)
. . .
13
(LSB)
14
Miscellaneous CDB information
15
CONTROL