HP C2246 Technical Reference Manual page 109

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'.._.,.;
Start/Stop Unit
Start/Stop Unit
The START /STOP UNIT command requests the Target to enable or disable the logical unit
for further operations.
Start/Stop Unit Command Descriptor Block (CDB}
Bit
Byte
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6
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5
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4
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3
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2
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1
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0
00 Opcode= lBH
01 Logical Unit Number
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Reserved
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IM MED
02-03 Reserved
04
Reserved
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Start
05 Control Byte
IMMED {Immediate). If the IMMED bit is set to one (1), status will be returned as soon
as the operation is initiated. The Target will respond to all commands received prior to the
completion of the spin-up sequence with a status of CHECK CONDITION. The response to a
Request Sense command will be a Sense Key of NOT READY. If IMMED is set to zero (0),
status will be returned after the operation is completed.
Start. A START bit of one (1) requests the logical unit be made ready for use. A START bit
of zero (0) requests that the logical unit be made not ready for use by stopping the spindle
motor until the next START UNIT command is sent.
SCSI Command Descriptions A·53