A document can be an item on the computer that stores information, data, options, or instructions which are combined with a computer system.In a graphical interface (GUI) for example Microsoft Windows, documents are shown as distinctive symbols that connect with this program that opens the file.

On most modern operating systems, files are organized into one-dimensional arrays of bytes. The format of a file is defined by its content since a file is solely a container for data, although, on some platforms the format is usually indicated by its filename extension, specifying the rules for how the bytes must be organized and interpreted meaningfully. 

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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.