Samsung SP0211N Service Manual page 10

SAMSUNG HARD DISK DRIVE
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. Spindle motor rotate a disk media at regular speed.This device start to rotate as
soon as put power on and no matter what HDD read or write data,spindle motor always revolve.
Besides accurate reading from the media point of view is possible when maintain the constant
speed within 0.1%,rotation error. The control circuit of spindle motor receive the index data
from the spindle motor or media at every spin and check whether constant speed persists or not
then revise the speed. Spindle motor is applied to DC brushless motor.
⑫ Disk-Damper
PALO(P80) series use Disk-damper for PES and acoustic noise. Disk-damper is located between
upper disk and bottom disk. Disk-damper reduce disk fluttering and acoustic noise by
air damping.
Disk-Damper
⑬ Magnetic Head
Magnetic field is formed around the conduct on passing electric current to conductor and
the direction and size of magnetic field are decided by those of an electric current.
Magnetic head build a minute gap in core (formed by ring) and pass an electric current then
strong magnetic leakage are occurred around gap thus magnetic particles of media vary the
direction according to the that of current: this is called recording. On the contrary, a
process induce magnetic signal to electric signal is called reading(decipherment).
⑭ Magnetic Disk
Recording carrier become a permanent magnet according to applying magnetic material to the
surface and change the magnetization direction of a electromagnet and it is possible to
store information during long term.
⑮ PCBA
PCBA is a circuit element concerning about HDD running and constructed in
engine IC,COMBO IC,read/write IC,ROM ,and sort of chip etc.
- Engine IC: contained RAM&Interface IC and exchange information to computer.
- COMBO IC: Controlling spindle motor & VCM running when HDD power on.
- Read/Write IC: read/write of HDD
- ROM: Checking HDD basic function and management basic spec.
PALO
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