Computer stands for “Common Operating Machine Particularly Used for Technical, Education and Research.”. A computer is an electronic box which can calculate almost all things.A computer is an electronic machine which can be used to solve various problems according to set of instruction given to it.

A computer is an electronic device which receives data, processes and produces the result in the form of information. A computer is a dummy box which can calculate everything.

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The hard disk was invented on September 13, 1956 by IBM team led by Rey Johnson (considered as “father” of the disk drive). Earlier hard disk drives were large and cumbersome devices.