Fujitsu M2488 manual Write Filemarks command 10h, Write Filemarks CDB Description

TAPE UNIT SCSI COMMANDS M2488 PRODUCT GUIDE

4-3.33 WRITE FILEMARKS command 10h

The WRITE FILEMARKS command requests the write of zero or more filemarks to tape. The filemarks will be written at the current logical position on tape. The Filemark count field indicates the number of filemarks to be written.

With a Filemark count of 0 and the Immediate bit set to 0, the WRITE FILEMARKS command will cause any data or filemarks previously buffered for writes to be written to tape. This is the SCSI-2 recommended method of causing buffered data and filemarks to be written to tape.

4-3.33.1 WRITE FILEMARKS CDB Description

WRITE FILEMARKS is a six-byte command. The bytes are shown below and described in Table 4-132. Common fields are described in paragraph 4-3.1 on page 4-4.

								BITS
BYTES	7		6	5		4			3		2	1		0
0	0		0	0		1			0		0	0		0
1
			LUN							Reserved					Immed
2
		MSB
3
							Filemark Count
4
																LSB
5
					Reserved								Flag			Link

Note: Changeable fields in the CDB are shaded.

Table 4-132. WRITE FILEMARKS Field Description

BYTE	BIT	VALUE	DESCRIPTION
0	0-7	10h	Operation code.
1	0	0 or 1	See Table 4-133 for description of Immediate (Immed) bit operation.
2-4			The 3 byte Filemark Count field is a 24 -bit unsigned number that indicates the
			number of filemarks to be written.

4-150 CG00000-011503 REV. A April 1997