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 logica l 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
000000000
1LUN Reserved
2Reserved
3Reserved
4Reserved
5Reserved 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.