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101

SCSI-2 Drive Command Set

Read (Group 1) Command (28H)

Chapter 2 2-83

SCSI-2 Drive Commands

FUA A Force Unit Access bit of 1 indicates that data is read

directly from the disk.

A Force Unit Access bit of 0 indicates that the drive may

access the cache memory.

Rel Adr 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.

Transfer

Length The Transfer Length field specifies the number of

contiguous logical blocks of data to be transferred.

A value of 0 indicates that no blocks will be transferred

and is not considered an error.

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.

NOTE For write-once media, blank checking is performed following a failed read.

If the sector is blank, the sense key/additional sense code will be set to

BLANK CHECK/Blank Sector Detected.

NOTE 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.

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