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WRITE FILEMARKS Command (10h) SDLT 600 SCSI Interface Guide

4-252 January 2005 81-81200-02 REV A01

4.39 WRITE FILEMARKS Command (10h)

The WRITE FILEMARKS command directs the SDLT tape drive to write the specified number of

Filemarks onto the tape, beginning at the current logical position. If the Immed bit is not set to 1, the

drive writes any data or Filemarks in the WRITE cache buffer to tape.

Figure 4-136. WRITE FILEMARKS Command Descriptor Block — Data Format

The WRITE FILEMARKS command can be used to force the drive to write any buffered WRITE data

to the tape medium. If the drive is in Buffered mode when it receives a WRITE FILEMARKS

command, it appends the requested Filemarks to the data and flushes the WRITE buffer contents to the

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 if Immed is set to 0.

Bit

Byte

7 6 5 4 3 2 1 0

0 Operation Code (10h)

1 Reserved WSMK (0) Immed

2 – 4

(MSB)

Transfer Length

(LSB)

5 Control

Table 4-147. WRITE FILEMARKS Command — Field Descriptions

Field Name Description

WSMK Write Setmark. Not supported. Must be set to 0.

Immed Immediate. When set to 0, the drive does not return status until all

buffered data and Filemarks are written to the medium. When set to 1,

the drive returns status as soon as it validates the CDB. If set to 1 and the

drive is not operating in Buffered mode (see Table 4-44 on page 4-72),

the drive returns a CHECK CONDITION status with the Sense Key set

to ILLEGAL REQUEST and the Additional Sense Code set to

INVALID FIELD IN CDB.

Transfer Length Contains the number of consecutive Filemarks to be written to the tape

medium. A value of 0 is not considered an error; the drive returns

GOOD status.

SDLT 600

SCSI Interface Guide

SCSI Commands

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