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6.1
TEST UNIT READY
BIT
BYTE
07
06
05
04
03
02
01
00
------1------1------1------1------1------1------1------
00
0
0
0
0
0
0
0
0
01
02
03
04
05
Logical Unit Number
Reserved
Reserved
Reserved
Reserved
Reserved (0)
(0 )
(0 )
(0 )
(0)
1
Flag
1
Link
Figure 6-1.
TEST UNIT READY Command
This command returns zero status if the requested unit is powered
on and ready.
If the drive is busy or reserved,
appropriate
status bits are set. If the drive is not operational, a check
condition will be set in the status byte. In that case, Sense
information will be preserved if a REQUEST SENSE command follows
immediately.
Valid Errors:
Error
Drive Not Ready
Write Fault
Selection Failure
Bad Argument
500504-00
Error Code
6-3
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