HP Surestore 80fx Optical Drive and Library SCSI-2 Command Reference - Page 117

SCSI-2 Drive Command Set Read Capacity Command (25H) Table 2-73 Read Capacity Command (25H) This command reads the capacity of the optical disk surface in the drive. The last logical block address and block length of the medium are returned. Read Capacity Command CDB Byte 7 6 5 4 3 2 1 0 0 Operation Code (25H) 1 Logical Unit Number (0) Reserved (0) RelAdr 2 Logical Block Address (MSByte) 3 Logical Block Address 4 Logical Block Address 5 Logical Block Address (LSByte) 6 Reserved (0) 7 Reserved (0) 8 Reserved (0) PMI 9 Reserved (0) Flag Link PMI A Partial Medium Indicator bit of 1 indicates that the logical block address field does not need to be set to 0. A PMI bit of 0 indicates that the logical block address field must be set to 0. 2-80 Chapter 2