HP 220mx Betriebsanweisung PDF herunterladen (Seite 122)

SCSI-2 Drive Command Set

Write (Group 1) Command (2AH)

Chapter 2 2-85

SCSI-2 Drive Commands

DPO A Disable Page Out bit of 1 instructs the target not to

store the data in the cache after it has been transferred

to the media.

A DPO bit of 0 instructs the target to store data in the

cache after it has been transferred to the media.

This bit is ignored.

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

automatically performed before writing the data.

An EBP bit of 1 suppresses the erase operation.

Transfer Length The Transfer Length field specifies the number of

contiguous logical blocks of data to be transferred for

this command.

A value of 0 indicates that no blocks of data 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 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.

1 2 ... 117 118 119 120 121 122 123 124 125 126 127 ... 377 378

Keine Kommentare

HP 220mx Betriebsanweisung Seite 122