Hard Disk Drive

This is a permanent Storage Device and Main Storage Device of the Computer. To Install the Operating System ( DOS, Windows, Linux, Mac etc., ) PC must have a Hard Disk Drive. We can Install various Softwares, and it can hold large amount of Data ( Depends on the Disk Capacity ).




Inside the Harddisk, Hard Coated Media Disks are used. We can read and write data several times on these disks. To perform read and write operations, Electro Magnetic Heads ( 16 or more ) are used both sides of the Media. Electro-Magnetic Heads are held by the Head Assembly Unit. An Electro Magnetic Motor is used to move the Head Assembly, from 0 track to the end of the Media.

Electro Magnetic Heads are connected to the Logical Control Board, which is located at the bottom of the Harddisk with the bus.

Logical Control Board converts the Analog Signals into Digital Data and Digital Data into Analog Signals. It also controls the Media Sprindle Motor, Head Assembly Motors. In the Output Stage of the Logical Control Board, a 4 Pin Power Connector ( 5v, 12v ), Jumper Set (Master-Slave) and Data Connectors ( IDE-40Pins or SCSI-50/34Pins or SATA-9Pins) are provided.

Hard Disk Types :

There are mainly 3 Types of Hard Disks are used to personal and server computing.

a. IDE ( Integrated Device Electronics )
b. SCSI ( Small Computer System Interface )
c. SATA ( Serial ATA )