File Format

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A file format explain the structure and kind of data stored in a file. The structure of a typical file may include a header as well as metadata, saved content, and an end-of-file (EOF) marker.The data stored in the file depends on the purpose of the file format. Some files, such as xml files, are worn to store lists of items, while others, such as JPEG image files simply contain a block of data.
 

File formats often have a published specification describing the encoding method and enabling testing of program intended functionality [further explanation needed]. Not all formats have freely available specification documents, partly because some developers view their specification documents as trade secrets, and partly because other developers never author a formal specification document, letting precedent set by other programs define the format.A file format also defines whether the data is stored in a binary format or plain text.

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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.