Hard disk is a secondary storage device.
The structure of a hard disc several disks on a single spindle.
All the disks are put inside a metal cover.
All the disks have two surfaces.
Each surface is again devided into circular parts called tracks.
Each track is again devided into a set of sectors.
Each surface of a disc has its own read write head.
The size of hard discs are now in certain Terra Bytes (TB).
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