Fujitsu MHW2040BH - Mobile 40 GB Hard Drive, Product Manual

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Device Configuration
2.1 Device Configuration
Figure 2.1 shows the disk drive. The disk drive consists of a disk enclosure (DE),
read/write preamplifier, and controller PCA. The disk enclosure contains the disk
media, heads, spindle motor, actuator, and a circulating air filter.
Figure 2.1 Disk drive outerview
(1) Disk
The outer diameter of the disk is 65 mm. The inner diameter is 20 mm.
(2) Head
The heads are of the load/unload (L/UL) type. The head unloads the disk out of
while the disk is not rotating and loads on the disk when the disk starts.
(3) Spindle motor
The disks are rotated by a direct drive Sensor-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 edge 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 on the ramp out of the disk and is fixed by a
mechanical lock.
(5) Air circulation system
The disk enclosure (DE) is sealed to prevent dust and dirt from entering. The
disk enclosure features a closed loop air circulation system that relies on the
blower effect of the rotating disk. This system continuously circulates the air
through the circulation filter to maintain the cleanliness of the air within the disk
enclosure.
2-2 C141-E245