HP C737990900 - Manual (Page 151)

Commands 151
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TEST UNIT READY 00h
T EST UNIT READY checks if the drive is ready for commands that access the
tape. This is done by the pre-execution Media Access check; it is not a request
for a self-test. If the drive has a tape loaded, the command returns a GOOD
status. Otherwise, CHECK CONDITION is reported and the sense key is NOT
READY .
Pre-Execution Checks:
Command Descriptor Block:
Test Unit Ready Specific Status:
If all the pre-execution checks pass, GOOD status is reported.
Illegal Field Reservation Deferred Error
Unit Attention Media Access Media Information
7 6 5 4 3 2 1 0
0 Operation Code (00h)
1
Reserved (0)
4
5
Control