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SCSI-2 Drive Command Set

Write (Group 5) Command (AAH)

Chapter 22-132

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

written directly to the disk.

An FUA bit of 0 indicates that write caching will be

allowed.

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.

EBP If the Erase By-Pass bit is set to 0, an erase is

automatically performed before writing the data.

An EBP bit of 1 suppresses the erase operation.

Transfer

Length The Transfer Length field indicates the number of

contiguous logical blocks to be transferred for this

command.

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.

ErsCntl The Erase Control bit is identical to the Erase Bypass

bit.

NOTE The 9.1 and 5.2 Gbyte capacity drives cannot Format, Erase, Write, or

Write and Verify 650 Mbyte and 1.3-Gbyte optical disks. The 2.6 Gbyte

capacity drives cannot Format, Erase, Write, or Write and Verify 650

Mbyte optical disks. If this command is issued with any of these drive/

media combinations, a CHECK CONDITION status will result with the

Sense Key/Additional Sense Code set to Data Protect/Write Protected.

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HP 220mx Guia do Utilizador Página 169