HGST Ultrastar 7K4000 (SAS) Hard Disk Drive Specification
240
18.43 START STOP UNIT (1B)
Table 205: 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 and Power Condition Modifier fields are used to specify that the logical unit be placed into a
power condition or to adjust a timer as defined in Table 206, If this field is set to a value other than 0h, then the
START bit shall be ignored.
Byte
Bit
76543210
0 Command Code = 1Bh
1 Reserved = 0 Immed
2 Reserved = 0
3 Reserved = 0 Power Condition Modifier
4 Power Condition Reserved=0
LoEj
= 0
Start
5 VU = 0 Reserved = 0 FLAG LINK
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