A text database or a set database, a flat file is a document of information that will not include links to different documents or is just a low-relational database. An example of the flat file is just a single-text-only record which has all of the information required for a course that’s usually divided by some type of delimiter.
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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.