Hitachi HUS154530VLF400 User Manual
Hitachi Ultrastar 15K450 (FC-AL) Hard Disk Drive Specification
269
19.42 START STOP UNIT (1B)
Table 230: START STOP UNIT (1B)
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
1 start the spindle
Note:
Once the drive has become ready (after a power on), the START STOP UNIT command can be used without any
errors regardless of the state of the motor: stopped or spinning.
Byte
Bit
7
6
5
4
3
2
1
0
0
Command Code = 1Bh
1
Reserved = 0
Reserved = 0
Immed
2-3
Reserved = 0
4
Power Conditions = 0
Reserved=0
LoEj
= 0
Start
5
VU = 0
Reserved = 0
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