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M2266S/H
Technical Handbook
Disks
The Winchester-type disks have an outer diameter of 130 mm (5.12 inches)
and an inner diameter of 40 mm (1.57 inches). The disks are good for at least
10,000 contact starts and stops.
The IDD uses the following number of disks:
M2266: 8 disks
Heads
The Whitney-type CSS (contact start/stop) heads are in contact with the
disks when the disks are not rotating, and automatically float when the
rotation reaches nominal speed.
Spindle Motor
The disks are turned by a direct-drive DC motor. The motor turns at 3600
rpm, ±0.2%. This precision is achieved through a feedback circuit which
includes Hall-effect elements mounted in the motor assembly.
Actuator
The actuator, which uses a rotary voice coil motor (VCM), consumes little
power and generates little heat. The head assembly on the tip of the actuator
arm is controlled by electrical feedback from servo information read-out
through the servo head.
Servo information is used as a control signal activating the actuator. It is
used as track crossing information in positioning, and track following
information during data write/read. The actuator positions heads on the
innermost landing zones over the disk when the power is off or the spindle
motor is stopped.
Air Circulation
The heads, disks, and actuator are sealed inside a disk enclosure (DE) 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
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F5810125-01 . . . A
Fujitsu America, Inc.
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