HP Surestore 80fx Optical Drive and Library SCSI-2 Command Reference - Page 61

NOTE NOTE NOTE SCSI-2 Drive Command Set Write (Group 0) Command (0AH) Transfer Length The Transfer Length field specifies the number of contiguous logical blocks of data to be written. A Transfer Length of 0 specifies that 256 logical blocks are to be written. 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. ErsCntl If the Erase Control bit is set to 0, an erase is automatically performed before writing the data. An Erase Control bit of 1 suppresses the erase operation. 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. For write-once optical disks, blank checking is performed before writing data. If a written block is detected during blank checking, the drive will return a CHECK CONDITION status. The sense key/additional sense code will be set to BLANK CHECK/Overwrite Attempted. When this command is used with 14X 512 OR 1024 byte/sector media, setting the ErsCntl bit or 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. 2-24 Chapter 2