Abstract
Modern data processing systems process larger and larger quantities of data in times which are becoming shorter and shorter. This applies to commercial large-capacity computing systems as well as to process control computers and intelligent terminals. The so-called working or main storage units which are worked on directly by the processor are, in spite of their substantial growth in the past years, in no way capable of accepting all necessary data. The sum of all data relevant to a system is thus filed in the secondary storage units. Disk files and magnetic tape units are the most important secondary storage units.
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