IBM clone, IBM compatible is a term to explain a PC, equipment, or application that’s IBM/PC Compatible. This doesn’t suggest that IBM produced the computer. Today, nearly all computers produced and used are both Computer (IBM compatible) and Apple Macintosh compatible.
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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.