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  1. keannu's Avatar
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      • South Korea
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    #1

    single pass.

    In the early days of computing, an information record of a computer' s memory content was kept on punched cards similar to the way in which an automated piano stores the keynote sequences on a piano roll. Later, magnetic tape was used to store electronic signals, and is still the favoured means of economically backing up the contents of hard drives. However, accessing information sequentially stored on tape is slow since the electronio data must be input through a fixed head in a single pass.

    These three underlined are hard to understand, especially "keynote" and "single pass".
    Does "keynote" mean "just musical note?
    Does "single pass" mean "one way moving"?

  2. emsr2d2's Avatar
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    #2

    Re: single pass.

    The "keynote sequence" is the sequence in which the individual keys are struck in order to create a tune.
    Remember - if you don't use correct capitalisation, punctuation and spacing, anything you write will be incorrect.

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    #3

    Re: single pass.

    A "single pass" means that there is just one opportunity. If you are reading a signal off of a tape, it must be read as the tape moves by. There is no going back or taking a second chance at it.

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