Hard Disk Drives

Hard disk Drives are one of the most important components of a computer. A secondary memory that stores all the information and the programs needed to run the computer, hard disk drives capacity today runs in Gigabytes.

A hard disk is a non-removable storage area in the computer that allows for access to the information stored on the electromagnetic surface of the disk.

Essentially a set of stacked disks, data is stored as tracks on the disks. The “Head” of the hard disk reads and writes the data on the hard disk as the disks rotate.

The rotation of the disk determines the “Seek time” or the time taken to perform a read or write operation. Typically the rotation speed in the hard disks varies between 5,000 RPM to 7,200 RPM (Rotations per minute).