Fujitsu MAS3184NC - Enterprise 18.4 GB Hard Drive, Product/Maintenance Manual

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C141-E185 1-7
(1) Disks
The disks have an outer diameter of 70 mm (2.8 inch) and an inner diameter of 25 mm (0.98 inch)
for MAS series. The disks are good for at least 20,000 contact starts and stops. Each model
contains following number of disks.
MAS3735NC/NP: 4
MAS3367NC/NP: 2
MAS3184NC/NP: 1
(2) Heads
The MR (Magnet - Resistive) of the CSS (contact start/stop) type heads are in contact with the
disks when the disks are not rotating, and automatically float when the rotation is started. Figure
1.3 shows the configuration of disks and heads
Figure 1.3 Disk/head configuration
(3) Spindle motor
The disks are rotated by a direct-drive hall-less DC motor. The motor speed is controlled by a
feedback circuit using the counter electromotive current to precisely maintain of the specified
speed.
(4) Actuator
The actuator, which uses a rotary voice coil motor (VCM), consumes little power and generates
little heat. The heads at the end of the actuator arm is controlled and positioned via feedback of
servo information in the data.
The heads are positioned on the CCS zone over the disks when the power is off or the spindle
motor is stopped.
0
1
2
3
4
5
6
7
MAS3735NC/NP
0
1
MAS3184NC/NP
0
1
2
3
MAS3367NC/NP
Base
Cover