MEDIA CHANGER COMMANDS M2488 PRODUCT GUIDE
6-30 CG00000-011503 REV. A March 1997
6-2.6 TEST UNIT READY MC 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.
6-2.6.1 TEST UNIT READY CDB Description
TEST UNIT READY is a six-byte command. The bytes are as shown below and described in
Table 6-34. Common fields are described in paragraph 4-3.1 on page 7-4.
6-2.6.2 TEST UNIT READY CHECK CONDITION Status
The medium-changer logical unit is Ready if the following conditions are met:
A. the medium-changer mode is System Mode
B. a magazine is present or a cartridge is loaded in the tape drive
If medium-changer is not Ready then CHECK CONDITION status is returned with the sense key
equal to NOT READY.
BITS
BYTES
76543210
0
00000000
1
LUN Reserved
2
Reserved
3
Reserved
4
Reserved
5
Reserved Flag Link
Note: Changeable fields in the CDB are shaded.
Table 6-34. TEST UNIT READY Field Description
BYTE BIT VALUE DESCRIPTION
0 0-7 00H Operation code.
