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SCSI Commands

Quantum DLT 4000 Tape Drive 5-163

WRITE FILEMARKS Command (10h) (continued)

Table 5–80 WRITE FILEMARKS Command Data - Field Descriptions

Field Name Description

WSmk Write Setmark. Must be 0. This tape drive does not support Setmarks.

Immed Immediate. When this bit is set to 1, the tape drive returns status as soon as

the Command Descriptor Block (CDB) has been validated, unless the

Filemark count is 0, or greater than 1 (since either condition causes the

WRITE buffer to be flushed to tape medium).

When set to 0, this bit indicates the status will not be returned until the

operation is complete.

Number of

Filemarks

This field contains the number of consecutive Filemarks to be written to

tape medium. A value of 0 is not considered to be an error; GOOD status is

returned.

The WRITE FILEMARKS command may be used to force the tape drive to write

any buffered WRITE data to the tape medium. If the tape drive is in buffered

mode, and WRITE FILEMARKS is received, the requested filemarks are

appended to the data and the WRITE buffer contents are flushed to tape

medium. A value of 0 in the Number of Filemarks field indicates that no

filemarks are to be written to the tape medium, but still flushes any WRITE data

to the tape medium.

If End of Tape (EOT) is detected while writing filemarks, the tape drive finishes

writing any buffered data and terminates with CHECK CONDITION status.

Within the Sense data, the End of Medium (EOM) bit is set, the Sense Key field

is set to NO SENSE and the Additional Sense Code and Additional Sense Code

Qualifier fields are set to EOM/P DETECTED. The tape drive attempts to

complete any subsequent WRITE FILEMARKS, returning a CHECK

CONDITION status in each case. If the tape drive encounters the physical EOM

when attempting a WRITE FILEMARKS, it returns CHECK CONDITION

status.

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Quantum DLT 4000 Handbuch Seite 263