Start/Stop Unit (1B) - IBM DDRS-39130 - Ultrastar 9.1 GB Hard Drive Specifications

7.31 START/STOP UNIT (1B)

Byte
7 6
0
1 LUN
2
3
4
5 VU = 0
Figure 113. 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 G O O D status shall always be returned immediately after command has been received. The TEST
UNIT READY command may be used to determine when the file becomes ready after a spin-up.
Start bit is to specify:
0 Stop 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.
Bit
5 4 3
Command Code = 1Bh
Reserved = 0
Reserved = 0
Reserved = 0
Reserved = 0
2 1 0
Immed
Start
FLAG LINK
SCSI C O M M A N D SET
147