Fujitsu MAN3367FC - Enterprise 36.7 GB Hard Drive, Product/Maintenance Manual

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General Description
1-6 C141-E133-02EN
(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 1.2 shows
the configuration of disks and heads
Figure 1.2 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 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 disk when the power is off or the spindle motor is
stopped.
(5) Air circulation (recirculation filter, breather filter)
The disk enclosure (DE) configures a sealed room to keep out dust and other pollutants. The DE has
a closed-loop air recirculation system. Using the movement of the rotating disks, air is continuously
cycled through a filter. This filter will trap any dust generated inside the enclosure and keep the air
inside the DE contaminant free. To prevent negative pressure in the vicinity of the spindle when the
disks begin rotating, a breather filter is attached. The breather filter also equalizes the internal air
pressure with the atmospheric pressure due to surrounding temperature changes.
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