Test Unit Ready Command
228 T10000: Interface Reference Manual August 2016
Test Unit Ready Command
The Test Unit Ready command checks if a device is loaded and ready to receive a
command that accesses the media, such as Read or Write commands.
Notes:
• Good status is returned if the tape drive is loaded and ready.
• Check Condition status with a sense key of Not Ready is returned if the tape
drive is not loaded.
• Busy status is returned if a Rewind, Erase, Load/Unload, or Locate command
with the immediate bit set was previously issued and the tape drive has not
completed the command.
TABLE 3-172 Test Unit Ready Command
Byte
Bit
76543210
0 Operation Code (00h)
1
thru
4
(MSB)
Reserved
(LSB)
5 Control Byte
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