Samsung 100737108-A , ,

Spinpoint M8-DVR OEM Product Manual REV 1.0

The disk stack assembly in the Spinpoint M8 hard disk drive consists of 1 or 2 disks and disk spacers secu red

on the hub of the spindle motor assembly b y a disk clamp. The glass disks have a sputtered thin-film magn etic

coating.

5.1.4 Head Stack Assembly

The head stack assembly cons ists 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-blo ck 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 h eads 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 voi ce 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 ph ysically 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 c an be positioned in

the requested cylinder.

5.1.6 Air Filtration System

Heads fly very close to the di sk surfaces. Therefore, it is very important that air circulating within th e 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 M8 h ard disk

drive is equipped with a re-circulating filter, which is lo cated 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.