HP 220mx Guia do Utilizador descarregar pdf (Página 166)

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101

SCSI-2 Drive Command Set

Read (Group 5) Command (A8H)

Chapter 2 2-129

SCSI-2 Drive Commands

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

store readahead data in cache after the read data has

been transferred to the initiator.

A DPO bit of 0 instructs the target it may store

readahead data in the cache after the read data has

been transferred to the initiator.

NOTE The DPO bit is ignored in 9.1 and 5.2 Gbyte capacity drives.

FUA A Force Unit Access bit of 1 indicates that the drive

reads from the disk.

An FUA bit of 0 indicates that data may come from 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 optical disks, 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.

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