Product manual

Spinpoint M9TU-USB 3.0 Product Manual REV 1.0
15
INSTALLATION
Figure 5-1: Exploded Mechanical View
5.1.5 Voice Coil Motor and Actuator Latch Assemblies
The rotary voice coil motor consists of upper and lower permanent magnets and magnetic yokes fixed to the
base casting and a rotary bonded coil on the head stack assembly. Each magnet consists of two alternating
poles and is attached to the magnet yoke. Pawl latch and rubber crash stops mounted on a magnetic yoke
physically prevent the head(s) from moving beyond the designed inner boundary 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 magnets move the voice coil s
o that heads can be positioned in the requested cylinder.
5.1.6 Air Filtration System
Heads fly very close to the disk surfaces. Therefore, it is very important that air circulating within the drive be
maintained free of particles. Seagate HDAs are assembled in a purified air environment to ensure cleanliness
and then sealed with a gasket. To retain this clean air environment, the Spinpoint M9TU-USB 3.0 hard disk
drive is equipped with a re-circulating filter, which is located in the path of the airflow close to the rotating
disk and is designed to trap any particles that may develop inside HDA.