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Command Specifications
This command moves the read/write heads of the disk drive to the initial position. A data block with
the logical block address of zero exists at the initial position (cylinder 0 / track 0). Initialization of
the disk drive's positioning control system and automatic adjustment are also performed by this
command.
3.1.10
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.
Bit 1 (LoEj (Load/Eject) of byte 4 of the CDB is the exclusive bit which controls devices with
replaceable recording media, and it has no meaning for the IDD. The IDD disregards the value
specified in this bit and controls starting and stopping of the spindle motor in accordance with the
"Start" bit only.
It is possible to select the disk drive's spindle motor starting mode through the setting terminal on the
IDD. If prohibition of motor starting control is set by this command at the setting terminal, the
spindle motor starts automatically when the IDD's power is switched on. It is also possible to delay
the starting time through the specifications in the CHANGE DEFINITION command. When the
setting terminal is being set to perform motor starting control by command, the IDD's spindle motor
will not start even when the power is switched on. In this case, it is necessary for the INIT to issue a
command to start the spindle motor. See the description of the motor starting mode in Section 5.3.2
of the Product Manual concerning the setting terminal.
Note:
The setting terminal specifies only the spindle motor starting method at power on time, and
whichever mode is set, this command is valid.
The INIT can issue this command whenever it is desired and stop or start the spindle motor
regardless of the state of the setting terminal.
3 - 36
7
6
5
LUN
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
Immed
0
0
0
0
LoEj
Start
0
Link
C141-E167
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