Fujitsu MPF3XXXAH Product Manual page 29

(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.
MPF3102AH: 1 disks
MPF3153AH: 2 disks
MPF3204AH: 2 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.
(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.
(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 recirculation filter to maintain the
cleanliness of the air in the disk enclosure.
(6) Read/write circuit
The read/write circuit uses a LSI chip for the read/write preamplifier. It improves data reliability
by preventing errors caused by external noise.
(7) Controller circuit
The controller circuit consists of an LSI chip to improve reliability.
microprocessor unit (MPU) achieves a high-performance AT controller.
2 - 2 C141-E106-01EN
The high-speed