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Spinpoint M8U-Internal Product Manual REV 3.4
23
INSTALLATION
5.1.3 Disk Stack Assembly
The disk stack assembly in the Spinpoint M8U hard disk drive consists of 1 or 2 disks and disk spacers secured
on the hub of the spindle motor assembly by a disk clamp. The glass disks have a sputtered thin-film
magnetic coating.
5.1.4 Head Stack Assembly
The head stack assembly consists of an E-block/coil sub-assembly, read/write heads, a flexible circuit, and
bearings. The E-block/coil sub-assembly is assembled with an E-block and over-molded coil. Read/write
heads are mounted to spring-stainless steel flexures that are then swage mounted onto the E-block arms.
The flexible circuit connects the read/write heads with the PCBA via a connector through the base casting.
The flexible circuit contains a read/write Preamplifier IC.
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 over-molded 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 so 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. Samsung 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 M8U 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.
5.1.7 Load/Unload Mechanism
Portable computer is exposed to heavy handling environment comparing with desk top
computer. Load/Unload mechanism provides to protect data loss caused by head hitting to disk due to
the abnormal shock and vibration in the transportation and handling.
When power is shut down, head will move to parking position on the ramp.