HP Surestore 200fx Optical Drive and Library SCSI-2 Command Reference - Page 185
Write Long Command DFH,
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NOTE SCSI-2 Drive Command Set Write Long Command (DFH) Transfer Length Rel Adr PBA SC The Transfer Length field specifies the number of bytes of data and ECC information to be read: 4096 media = 4760 bytes (4096 data + 664 pointer, CRC, pad, & ECC). For 9.1 Gbyte Capacity drives only. 2048 media = 2380 bytes (2048 data + 332 pointer, CRC, pad, and ECC). For 5.2 Gbyte capacity drives only. 1K media = 1200 bytes (1024 data + 176 pointer, CRC, pad, &ECC). 512 media = 610 bytes (512 data + 98 pointer, CRC, pad, &ECC). All other numbers are rejected unless SC = 1. A relative address bit of one indicates that logical block address specified is a two's complement offset from the last logical block address accessed. A value of 0 indicates that the logical block address is an absolute address. 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. A Sector Count bit of 1 indicates the transfer length is represented in sectors rather than bytes. A "sector" consists of 2380 bytes for 2048 media, 1200 bytes for 1024 media or 610 bytes for 512 media. A Sector Count bit of 0 indicates the transfer length is represented in bytes. If this command is executed for write-once disks, the drive returns a CHECK CONDITION status with the Sense Key/Additional Sense Code set to Illegal Request/Invalid Command Operation Code. 2-148 Chapter 2