HP Surestore 80fx Optical Drive and Library SCSI-2 Command Reference - Page 119

SCSI-2 Drive Command Set Read (Group 1) Command (28H) NOTE Table 2-75 NOTE Read (Group 1) Command (28H) This command reads data from the specified logical block address. The Mode Select Commands (15H, 55H) impact read, write, format, and erase commands. Read (Group 1) Command CDB Byte 7 6 5 4 3 2 1 0 0 Operation Code (28H) 1 Logical Unit Number DPO FUA Reserved (0) RelAdr (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 PBA Reserved (0) Flag Link DPO 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. The DPO bit is ignored in 9.1 and 5.2 Gbyte capacity drives. 2-82 Chapter 2