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SCSI-2 Drive Command Set
Read (Group 1) Command (28H)
Read (Group 1) Command (28H)
This command reads data from the specified logical block address.
NOTE
The Mode Select Commands (15H, 55H) impact read, write, format, and
erase commands.
Table 2-75
Read (Group 1) Command CDB
Byte
7
0
1
6
5
4
3
2
1
Operation Code (28H)
Logical Unit Number
(0)
DPO
FUA
Reserved (0)
2
Starting Logical Block Address (MSByte)
3
Starting Logical Block Address
4
Starting Logical Block Address
5
Starting Logical Block Address (LSByte)
6
Reserved (0)
7
Transfer Length (MSByte)
8
Transfer Length (LSByte)
9
DPO
0
PBA
Reserved (0)
Flag
RelAdr
Link
A Disable Page Out bit of 1 instructs the target not to
store readahead data in cache after the read data has
been transferred to the initiator.
A DPO bit of 0 instructs the target it may store
readahead data in the cache after the read data has
been transferred to the initiator.
NOTE
The DPO bit is ignored in 9.1 and 5.2 Gbyte capacity drives.
2-82
Chapter 2