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What's inside a computer?

Hard Disk

( 1990 ) A hard disk is a magnetic device that can read and you can write information. Information is not lost even when the power is off.

A hard disk is a permanent external store of computer information. It stores operating system files, programs and data, and user-generated documents. Disk capacity is measured in terms of gigabytes (1GB = 1000 MB). A desktop PC hard disk can store as much information as thousands of CD-ROMs or tens of thousands of floppy disks. The data transfer rate is thousands of times faster than for floppy disks.