User Manual

SCSI Commands Reference Manual, Rev. J 140
www.seagate.com Direct Access Block commands (SPC-5 and SBC-4)
3.17 READ (12) command
The READ (12) command (see table 99) requests that the device server read the specified logical block(s) and transfer them to
the data-in buffer. Each logical block read includes user data and, if the medium is formatted with protection information
enabled, protection information. Each logical block transferred includes user data and may include protection information,
based on the RDPROTECT field and the medium format.
See the READ (10) command for the definitions of the fields in this command.
Table 99 READ (12) command
Bit
Byte
7 6 5 4 3 2 1 0
0
OPERATION CODE (A8h)
1
RDPROTECT DPO FUA RARC Obsolete Obsolete
2
(MSB)
LOGICAL BLOCK ADDRESS
. . .
5
(LSB)
6
(MSB)
TRANSFER LENGTH
. . .
9
(LSB)
10
RESTRICTED FOR
MMC-6
Reserved GROUP NUMBER
11
CONTROL