Hard Disk

 A hard drive consists of spinning platters made up of aluminum or ceramic that are coated with magnetic media. the platters come in various sizes. the hard drive with many different storage capacities can be created depending upon the density size and number of platters.

This is also called as secondary memory. there can be several programs in the system. which cannot be stored in RAM so we need a very huge non volatile memory which can be used for storing all the programs and data when the system is not is use are called as hard disks. 

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