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SCSI-2 Drive Command Set

Write and Verify (Group 5) Command (AEH)

Chapter 22-138

EBP An Erase By-Pass bit of 0 indicates an erase

automatically performs before writing the data.

An EBP bit of 1 suppresses the erase operation.

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 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.

NOTE For write-once optical disks, blank checking is performed before writing

data. If a written block is detected during blank checking, the drive will

return a CHECK CONDITION status. The sense key/additional sense

code will be set to BLANK CHECK/Overwrite Attempted.

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HP 220mx Betriebsanweisung Seite 175