Computer Science
Even before the first computer was conceptualized, data had already been stored on hard copy medium and used with a machine. As early as 1801, the punched card was used as a control device for mechanical looms. One and one-half centuries later, IBM joined punched cards to computers, encoding binary information as patterns of small rectangular holes. Today, punch cards are rarely used with computers. Instead, they are used for a handful of train tickets and election ballots. Although some may find it surprising, a computer printout is another type of hard copy medium. Pictures, barcodes, and term papers are modern examples of data storage that can later be retrieved using optical technology. Although it consumes physical space and requires proper care, non-acidic paper printouts can hold information for centuries. If long-term storage is not of prime concern, magnetic medium can retain tremendous amounts of data and consume less space than a single piece of paper.
The magnetic......
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