Pioneer SCSI-2 Manuale Utente

Request Sense

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Operation Code is (03h).

The REQUEST SENSE command requests the drive to transfer extended sense data to the

initiator.  The drive supports the first 18 bytes of the extended sense data format. The drive will

transfer Allocation Length bytes or 18 bytes, whichever is smaller.

A valid bit of zero indicates that the information field is not as defined in the SCSI-2

standard.  A valid bit of one indicates the information field contains valid information as

defined in the SCSI-2 specifications.

FileMk (File mark) if one indicates that the current command has read a file mark.

EOM (End of Medium) if one indicates that an end-of-medium condition  exists.

An incorrect length indicator bit set to one indicates that the requested logical block length

did not match the logical block length of the data on the medium.

Provides generic categories in which error and exception conditions can be reported.  Table

2-31B lists the supported sense keys.

Additional sense codes and additional sense code qualifier provides further detail

describing the sense key.  These codes are listed in Table 2-31C.

Indicates the number of additional sense bytes to follow.  If the allocation length of the

command descriptor block is to small to transfer all of the additional sense bytes, the

additional sense length is not adjusted to reflect the truncation.

The field contains information that depends on the command which was executed.  Further

definition for this field is contained within the command description.

(Sense Key Specific Valid) The sense-key specific field is defined when the sense-key

specific valid (SKSV) bit is one.  A SKSV value of zero indicates that this field is not

defined.