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What is HDD ?

A hard disk drive (HDD), hard disk, hard drive or fixed disk is a data storage device that uses magnetic storage to store and retrieve digital information or data using one or more rigid rapidly rotating disks (platters) coated with magnetic material.
 
Even your operating system is stored on your computer's hard drive.

 Hard-disk is a non-volatile memory.
SATA drive are commonly used.
Types of HDD :

 IDE:Integrated Drive Electronics.drives it is also known as PATA. 







SATA : Serial advance technology attachment.










SCSI : Small Computer System Interface.






SAS : Serial Attached SCSI.












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