Quantum FIREBALL PLUS AS 10.2 User Manual

Basic Principles of Operation
Quantum Fireball Plus AS 10.2/20.5/30.0/40.0/60.0 GB AT 5-4
5.1.4
5.1.45.1.4
5.1.4 Headstack Assembly
Headstack AssemblyHeadstack Assembly
Headstack Assembly
The headstack assembly consists of read/write heads, head arms, and a coil joined
together by insertion molding to form a rotor subassembly, bearings, and a flex
circuit. Read/write heads mounted to spring-steel flexures are swage mounted onto
the rotary positioner assembly arms.
The flex circuit exits the HDA through the base casting. A cover gasket seals the
gap. The flex circuit connects the headstack assembly to the PCB. The flex circuit
contains a read preamplifier/write driver IC.
5.1.5
5.1.55.1.5
5.1.5 Rotary Positioner Assembly
Rotary Positioner AssemblyRotary Positioner Assembly
Rotary Positioner Assembly
The rotary positioner, or rotary voice-coil actuator, is a Quantum-proprietary
design that consists of upper and lower permanent magnet plates, a rotary single-
phase coil molded around the headstack mounting hub, and a bearing shaft. The
single bi-polar magnet consists of two alternating poles and is bonded to the magnet
plate. A resilient crash stop prevents the heads from being driven into the spindle
or off the disk surface.
Current from the power amplifier induces a magnetic field in the voice coil.
Fluctuations in the field around the permanent magnet cause the voice coil to move.
The movement of the voice coil positions the heads over the requested cylinder.
5.1.6
5.1.65.1.6
5.1.6 Automatic Actuator Lock
Automatic Actuator LockAutomatic Actuator Lock
Automatic Actuator Lock
To ensure data integrity and prevent damage during shipment, the drive uses a
dedicated landing zone, an actuator magnetic retract, and Quantum’s patented
Airlock
®
. The Airlock holds the headstack in the landing zone whenever the disks
are not rotating. It consists of an air vane mounted near the perimeter of the disk
stack, and a locking arm that restrains the actuator arm assembly.
When DC power is applied to the motor and the disk stack rotates, the rotation
generates an airflow on the surface of the disk. As the flow of air across the air vane
increases with disk rotation, the locking arm pivots away from the actuator arm,
enabling the headstack to move out of the landing zone. When DC power is
removed from the motor, an electronic return mechanism automatically pulls the
actuator into the landing zone, where the magnetic actuator retract force holds it
until the Airlock closes and latches it in place.

Quantum FIREBALL PLUS AS 10.2 Specifications

General

Brand	Quantum
Model	FIREBALL PLUS AS 10.2
Category	Storage
Language	English