A hard drive is a mass storage device found in all PCs that is used to store permanent data such as the operating system, programs and user files.
The data on hard drives can be erased and/or overwritten, the hard drive is classed as a non-volatile storage device which means it doesn't require a constant power supply in order to retain the information stored on it (unlike RAM).
Inside every hard drive are small round disk-like objects made of either an aluminum/alloy or a glass/ceramic composite, these are called platters, each platter is coated with a special magnetic coating enabling them to store data magnetically.
Hovering above these platters are read/write heads that transfer data to and from the platters.
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