Fujitsu MAH3091MC - Enterprise 9.1 GB Hard Drive, Maintenance Manual

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C141-E103-01EN 1 - 7
(1) Disks
The disks have an outer diameter of 95 mm (3.74 inch) and inner diameter of 25 mm (0.98 inch)
for MAH series, and 84 mm (3.3 inch) outer diameter and 25 mm (0.98 inch) inner diameter for
MAJ series. The disks are good for at least 15,000 contact starts and stops. Each model contains
following number of disks.
MAH3182: 2
MAH3091: 1
MAJ3364: 5
MAJ3182: 3
MAJ3091: 2
(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
1.5 shows the configuration of disks and heads
Figure 1.5 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 the speed at ±0.5%
of the specified speed.
(4) Actuator
The actuator, which uses a rotary voice coil motor (VCM), consumes little power and generates
little heat. The head assembly at the end of the actuator arm is controlled and positioned via
feedback of servo information in the data.
MAJ3182 MAJ3364
0
1
2
3
4
5
6
7
8
9
0
1
2
MAJ3091
0
1
2
3
4
MAH3182
0
1
2
3
MAH3091
0
1