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4.1.8
REZERO UNIT (01)
Bit
Byte
0
1
2
3
4
5
This command moves the read/write heads of the disk drive to the initial position (physical
cylinder 0 / physical track 0). A data block with the physical block address of zero exists at
the initial position. Initialization of the disk drive's positioning control system and automatic
adjustment are also performed by this command.
Since processing which is comparable to this command is included in the IDD's internal error
recovery processing, except in cases where the IDD's error recovery processing is prohibited in
the parameter of the MODE SELECT command, it is not necessary for the INIT to expressly
issue this command. for details, see the "Error Recovery Specifications".
4.1.9
START/STOP UNIT (1B)
Bit
Byte
0
1
2
3
4
5
This command controls starting and stopping of the disk drive's spindle motor. Control of the
spindle motor is performed through the "Start" bit in bit 0 of the CDB byte 4.
The spindle motor can be stopped if this command is issued with the "Start" bit as "0." On the
other hand, the spindle motor can be started by specifying "1" in the "Start" bit.
7
6
5
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
7
6
5
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
C141-E054-02EN
4
3
2
X'01'
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
4
3
2
X'1B'
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
1
0
0
0
0
0
0
0
0
0
0
0
1
0
0
Immed
0
0
0
0
LoEj
Start
0
0
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