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16 January, 03:42

The IBM nine-track tapes that became the industry standard for storage for three decades had several sizes, the most common being 2400 feet. The high density version stored data at 1600 bits/inch/track. If the whole tape (not including the parity track) could be used for data storage, how much raw data could one of these tapes hold?

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  1. 16 January, 06:41
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    5 MB.

    Explanation:

    1 foot = 12 inches

    2400/9=266.66 feet per track

    1 track excluding, remaining 8 track = 2400 - 266.66 = 2133.33 feet

    so, space available to store data = 2133.33 feet

    now, 2133.33 feet = 25600 inches

    total data that can be stored = 25600 * 1600 = 40960000 bits

    = 46080000/8 = 5120000 Bytes

    = 5120000/1000000 = 5.12 MB = 5 MB (approx.)
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