A hard disk drive is a computer device that allows data to be stored permanently. A hard drive (HDD), stores data even when it is powered down making it non-volatile, an example of volatile memory would be RAM which does lose data when it is powered down.
Data is written to a hard disk in the form if a magnetic signal in the surface of the platters, platters are broken down to specific areas.
Hard drives connect to a computer using a bus through an interface most often IDE or SATA although there are other interfaces such as SCSI and Fibre Channel.
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