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Most hard disks deploy
the Winchester technology which has the following characteristics:
1.
Read/Write head, disk and all moving parts are enclosed.
2.
The head will not touch the disk
3.
The
disk surface is smooth
hard disks are made of HDA(head
disk assembly) and PCBA (printed circuit Board Assembly)
On the bottom of the drive, a printed circuit board, also known
as a logic board, receives commands from the drive's controller, which is
managed by the OS and system BIOS. The logic board translates those commands
into voltage fluctuation which moves the read/write head across the platter and
controls whether to read or write. On a IDE (Integrated Drive Electronics )
Disk, the disk controller is part of the logic board.
A spindle connected to an electrical motor spins as many as
eight magnetically coated platters as thousand revolutions per minute. The
number of platters and the coating material determines the storage capacity of
the drive. Nowadays, hard disks are typically coated with alloy about 3
millionths of an inch thick.
The head actuator will move the read/write head to exactly where
the needed information is stored.
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