HP Surestore 80ex Optical Drive and Library SCSI-2 Command Reference - Page 142
Transfer, Length, For 9.1 Gbyte Capacity drives, For 5.2 Gbyte Capacity drives, only., Rel Adr
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NOTE SCSI-2 Drive Command Set Read Long Command (3EH) Transfer Length PBA SC Rel Adr 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, & 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 for 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. When this command is executed with 14X 512 or 1024 byte/sector media, the drive will return a CHECK CONDITION status. The sense key/ additional sense code will be set to ILLEGAL REQUEST/INVALID COMMAND. Chapter 2 2-105 SCSI-2 Drive Commands
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