Fujitsu M2488 manual Test Unit Ready command 00h, Test Unit Ready CDB Description

TAPE UNIT SCSI COMMANDS M2488 PRODUCT GUIDE

4-3.30 TEST UNIT READY command 00h

The TEST UNIT READY command provides a means to check if the logical unit is ready. This is not a request for a self-test. If the logical unit would accept an appropriate medium-access command without returning CHECK CONDITION status, this command returns a GOOD status.

4-3.30.1 TEST UNIT READY CDB Description

TEST UNIT READY is a six-byte command. The bytes are as shown below and described in Table 4-127. 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		0		0	0	0		0
1		LUN						Reserved
2						Reserved
3						Reserved
4						Reserved
5				Reserved						Flag		Link

Note: Changeable fields in the CDB are shaded.

Table 4-127. TEST UNIT READY Field Description

BYTE

BIT

VALUE

DESCRIPTION

0

0-7

00H

Operation code.

4-3.30.2 TEST UNIT READY CHECK CONDITION Status

If a tape is not inserted or the drive is not ready, CHECK CONDITION status is returned with the sense key set to NOT READY.

4-138 CG00000-011503 REV. A April 1997