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PRODUCT DESCRIPTION
2 – 5
Major HDA Components
Drive Mechanism
A brush-less DC direct drive motor rotates the spindle at 5,400 RPM (±0.1%). The dynamically balanced
motor/spindle assembly ensures minimal mechanical run-out to the disks. A dynamic brake provides a fast
stop to the spindle motor upon power removal. The speed tolerance includes motor performance and motor
circuit tolerances.
Rotary Actuator
All DiamondMax™ 4320 drives employ a rotary voice coil actuator which consists of a moving coil, an
actuator arm assembly and stationary magnets. The actuator moves on a low-mass, low-friction center shaft.
The low friction contributes to fast access times and low power consumption.
Read/Write Electronics
An integrated circuit mounted within the sealed head disk assembly (near the read/write heads) provides up
to eight head selection (depending on the model), read pre-amplification and write drive circuitry.
Read/Write Heads and Media
Low mass, low force magneto-resistive read/write heads record data on 3.5-inch diameter disks. Maxtor uses
a sputtered thin film medium on all disks for DiamondMax 4320 drives.
Air Filtration System
All DiamondMax 4320 drives are assembled in a Class 100 controlled environment. Over the life of the drive,
a 0.1 micron filter and breather filter located within the sealed head disk assembly (HDA) maintain a clean
environment to the heads and disks. DiamondMax 4320 drives are designed to operate in a typical office
environment with minimum environmental control.
Microprocessor
The microprocessor controls the following functions for the drive electronics:
Command execution
Cache management
Data correction and error recovery
Diagnostic execution
Data sequencing
Head positioning (including error recovery)
Host interface
Index detection
Spin speed control
Seeks
Servo
S.M.A.R.T.