HP Surestore 80ex Optical Drive and Library SCSI-2 Command Reference - Page 62
Seek (Group 0) Command (0BH),
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SCSI-2 Drive Commands SCSI-2 Drive Command Set Seek (Group 0) Command (0BH) Table 2-19 NOTE NOTE Seek (Group 0) Command (0BH) This command seeks the optical head to the physical track where the specified logical block exists. Seek (Group 0) Command CDB Byte 7 6 5 4 3 2 1 0 0 Operation Code (0BH) 1 Logical Unit Number (0) Logical Block Address (MSByte) 2 Logical Block Address 3 Logical Block Address (LSByte) 4 Reserved (0) 5 PBA Reserved (0) Flag Link PBA A Physical Block Address bit of 1 indicates that physical block addressing is used. A PBA bit of 0 indicates that logical block addressing is used. When this command is used with 512 byte/sector 4X/ 8X/14X media, 1024 byte/sector 8X/14X media, or 2048 14X media, it is not possible to address all logical blocks on the disk because those media types contain >221 logical blocks. When this command is used with 14X 512 or 1024 byte/sector media, setting the PBA bit will cause the drive to return a CHECK CONDITION status. The sense key/additional sense code will be set to ILLEGAL REQUEST/INVALID FIELD in CDB. Chapter 2 2-25