A Hard Disk, commonly referred to as a Hard Drive or Fixed Disk is a non-volatile storage device which stores digitally encoded data on rapidly rotating platters with magnetic surfaces. Strictly speaking, “drive” refers to a device distinct from its medium, such as a tape drive and its tape, or a floppy disk drive and its floppy disk. Early Hard Disk Drive had removable media; however, an Hard Disk today is typically a sealed unit with fixed media.

Hard Disk was developed for use with computers. In the 21st century, applications for Hard Disk have expanded beyond computers to include digital video recorders, digital audio players, personal digital assistants, digital cameras, and video game consoles. In 2005 the first mobile phones to include Hard Disk were introduced by Samsung and Nokia.

Hard disk magnetic plates are used to store the data on the disk and head on the hard disk supports in reading and writing of the data. When head finds any scratches on the magnetic plates; sound is produced when head revolves on the plate to that specific sector for reading or writing data. This needs to be taken care of immediately because if you start fixing the damage then it may result in further disk damage. Immediately shutdown your system and call any recovery experts for consultation. Data stored in hard disk is very sensitive it should be examined and recover in clean room labs.

Bad sectors of the Hard disk:

Bad sectors of the hard disk are areas on the tracks of magnetic plates which get corrupted due to some reason. When head try to read data from these sectors, its all attempts go in vain. Sound heard during the reading of that corrupted sectors which indicates that some of the sectors are failed and damaged.
If hard disk is very old and its condition seems to be very bad; best tip to stream line it again is to scan the whole disk for bad sectors. Scanning process will help in identification of all the damaged or corrupted areas and it will not let hard disk to write any thing on those sectors again.

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