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4.6 Packet Commands
C156-E227-01EN 4-77
4.6.19 START/STOP UNIT command
Table 4.107 START/STOP UNIT command
Bit
Byte
76543210
0 Operation Code (1Bh)
1 Logical Unit Number Reserved
IMMED
2-3 Reserved
4 Reserved LoEj Start
5-11 Reserved
The START/STOP UNIT command ejects media or starts and stops rotating the
disk.
When the IMMED (Immediate) bit is 1, command completion is reported before
processing is completed.
Processing for other values is listed in Table 4.108.
Table 4.108 START/STOP/EJECT processing
LoEj Start Processing
0 0 Stops disk rotation.
0 1 Starts disk rotation and checks the format type of media.
1 0 Ejects media if possible.
1 1 Ends abnormally (ILLEGAL REQUEST).