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C141-E056-01EN2 - 2
(1) Disk
The outer diameter of the disk is 95 mm. The inner diameter is 25 mm. The number of disks
used varies with the model, as described below. The disks are rated at over 40,000 start/stop
operations.
MPC3045AH: 2 disks
MPC3065AH: 3 disks
(2) Head
The heads are of the contact start/stop (CSS) type. The head touches the disk surface while the
disk is not rotating and automatically lifts when the disk starts.
Figure 2.2 illustrates the configuration of the disks and heads of each model. In the disk
surface, servo information necessary for controlling positioning and read/write and user data
are written. Numerals 0 to 5 indicate read/write heads.
MPC3065AH ModelMPC3045AH Model
Spindle
0
1
3
2
Actuator
Spindle
1
2
0
3
5
4
Actuator
Figure 2.2 Configuration of disk media heads
(3) Spindle motor
The disks are rotated by a direct drive Hall-less DC motor.
(4) Actuator
The actuator uses a revolving voice coil motor (VCM) structure which consumes low power
and generates very little heat. The head assembly at the tip of the actuator arm is controlled
and positioned by feedback of the servo information read by the read/write head. If the power
is not on or if the spindle motor is stopped, the head assembly stays in the specific CSS zone
on the disk and is fixed by a mechanical lock.