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M40S
8
SAMSUNG HARD DISK DRIVE
6 Pivot Bearing
Pivot bearing is a roll bearing fixed the center of gyration of ARM. Inner Race is fixed by
screw after being connected to Base pivot and outer Race is fixed by retaining ring after
being connected by ARM's hole and make the ARM's revolving movement actively.
7 Breather Filter
In the interior of HDD, air flow is formed by the spinning disk in high speed and pressure
distribution occurred. This pressure is lower than atmospheric pressure of the exterior of
HDD and due to this, the outside air inflow into the interior caused contamination.
Breather filter fixed in inflow plug induce clean air and help air circulation.
8 Window Clock
Head must know the data's location information to access data on disk. Servo write is
a process of recording information disk. To record information, we make hole that head
for servo write can enter the interior of HDD and this hole is window clock.
This hole is closed with sealing label after done servo writing, be careful not to be
occurred inner contamination due to label's injury.
9 Window Push Pin
Head should be controlled to move on disk at a regular track pitch interval rate during
servo writing. ARM is torqued by VCM continuously and was controlled each track's moving
using push pin. Window push pin is a hole for this, the pin could enter interior of HDA
and be careful contamination caused by label's injury because this hole is closed by sealing
label after done servo writing.
10 Jump Pin
During installing, HDD need setting of pin organization in the next according to
the drive running mode: master drive in single system, master drive in dual system,
slave drive in dual system.
11 Spindle Motor
Spindle motor is a sort of small motor which can change electric energy to mechanical energy
utilizing for magnetic field. When the current of stator's coil formed by electromagnet
is on, magnetic power occur between stator and rotator. (repeal occur between same pole and
attract occur in case of different pole) This power can make rotator revolve and we should
keep on changing the magnetic pole of the stator to maintain rotate at regular speed.
To progress this function, we deduct rotation speed and circuit for controlling needed.
It is possible to control the current flow and time interval with Hall element and MR
element (these are sensitive to voltage change). The magnetic disk of hard disk is running
by DC Brushless direct drive motor directly. Brush has long life and high reliability
because it doesn't have belt. Recently we use flat motor to be adopted to the request of
minimizing. The rotation bearing is supported by Fluid Dynamic Bearing(FDB), this is not
keeping high speed spinning but also reducing resistance even eliminating and this make the
acceleration better.
The life of hard disk is up to the durability of this bearing supporting revolving axis.
Spindle motor rotate a disk media at regular speed.This device start to rotate as soon as