TAPE UNIT SCSI COMMANDS M2488 PRODUCT GUIDE
4-138 CG00000-011503 REV. A April 1997
4-3.30 TEST UNIT READY 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.
4-3.30.1 TEST UNIT READ Y CDB Descrip tion
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.
4-3.30.2 TEST UNIT READ Y CHECK CONDI TION Statu s
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.
BITS
BYTES 76543210
000000000
1LUN Reserved
2Reserved
3Reserved
4Reserved
5Reserved 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.