HP Surestore 80fx Optical Drive and Library SCSI-2 Command Reference - Page 144
Transfer, Length, For 9.1 Gbyte Capacity drives, For 5.2 Gbyte Capacity drives, Rel Adr
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NOTE SCSI-2 Drive Command Set Write Long Command (3FH) Transfer Length PBA SC Rel Adr The Transfer Length field specifies the number of bytes of data and ECC information to be written. • 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, & 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 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 2K media, 1200 bytes for 1K media or 610 bytes 512 media. A Sector Count bit of 0 indicates the transfer length is represented in bytes. 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. 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. Chapter 2 2-107 SCSI-2 Drive Commands