User Manual

SCSI Commands Reference Manual, Rev. J 142
www.seagate.com Direct Access Block commands (SPC-5 and SBC-4)
3.19 READ (32) command
The READ (32) command (see table 102) 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.
The READ (32) command shall only be processed if type 2 protection is enabled (see SBC-4).
Table 102 READ (32) command
Bit
Byte
7 6 5 4 3 2 1 0
0 OPERATION CODE (7Fh)
1 CONTROL
2
Reserved. . .
5
6 Reserved GROUP NUMBER
7 ADDITIONAL CDB LENGTH (18h)
8 (MSB)
SERVICE ACTION (0009h)
9 (LSB)
10 RDPROTECT DPO FUA RARC Obsolete Reserved
11 Reserved
12 (MSB)
LOGICAL BLOCK ADDRESS. . .
19 (LSB)
20 (MSB)
EXPECTED INITIAL LOGICAL BLOCK REFERENCE TAG. . .
23 (LSB)
24 (MSB)
EXPECTED LOGICAL BLOCK APPLICATION TAG
25 (LSB)
26 (MSB)
LOGICAL BLOCK APPLICATION TAG MASK
27 (LSB)
28 (MSB)
TRANSFER LENGTH. . .
31 (LSB)