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Hard Drive Evolution
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Even before the first commercial computers appeared in 1951, "mass" storage, although minuscule by today's standards, was a necessity. As early as the mid-1800s, punch cards were used to provide input to early calculators and other machines. The 1940s ushered in the decade when vacuum tubes were used for storage until, finally, tape drives started ....
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....The inner disk that holds the data usually is made of Mylar and coated with a magnetic oxide, and the outer, plastic cover, bends easily. The inner disk of today’s smaller, 3.5-inch floppies is similarly constructed, but they are housed in a rigid plastic case, which is much more durable than the flexible covering on the larger diskettes.
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