John M. Harker

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This paper traces the development of disk file technology from the first disk drive to the present. A number of innovative advances are reviewed in the evolution of mechanical design, materials, and processes. These advances constitute the technological base that has permitted almost four orders of magnitude of improvement in areal density; they are(More)
In the early days of electronic data processing, new application requirements arose that could not be met adequately by batch processing, a mode dictated by the sequential nature of card and tape input-output equipment. Users needed a device to store and directly access relatively large amounts of data on-line. The first such products, IBM's RAMAC disk file(More)
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