8.36 START STOP Unit (1Bh)
LINK
FLAG
Reserved = 0
VU = 0
5
Start
LoEj
= 0
Reserved
= 0
Power Conditions = 0
4
Reserved = 0
2
3
Immed
Reserved = 0
Reserved = 0
1
Command Code = 1Bh
0
0
1
2
3
4
5
6
7
Bit
Byte
Figure 165. START STOP Unit
The START STOP UNIT command is used to spin up or stop the spindle motor.
!
Immed bit is to specify
0
status is to be returned at the end of the operation
1
GOOD status shall always be returned immediately after command has been received.
The TEST UNIT READY command may be used to determine when the drive becomes
ready after a spin-up.
!
Power Conditions is not supported by the drive and must be set to 0.
!
LoEj is not supported by the drive and must be set to 0.
!
Start bit is to specify:
0
stop the spindle
1
start the spindle
Note: When the drive has become ready (after a power on), the START STOP UNIT command can be
used without any errors regardless of whether the motor is stopped or spinning.
Ultrastar 146Z10 hard disk drive specifications
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