SMART attribute #203 -- Run Out Cancel

Discussion in 'Storage Devices' started by Franc Zabkar, Apr 8, 2010.

  1. Franc Zabkar

    Franc Zabkar Guest

    All the sources I can find suggest that the meaning of the Run Out
    Cancel SMART attribute (#203) is "Number of ECC errors".

    http://en.wikipedia.org/wiki/S.M.A.R.T.#Known_ATA_S.M.A.R.T._attributes

    This makes no sense to me. Runout is a measure of eccentricity.
    Therefore I would think that run out cancel should reflect the
    amplitude of the sinusoidal error signal required to be injected into
    the voice coil servo loop to compensate for any eccentricity in the
    track, assuming that's how it's done.

    I wonder if someone originally misinterpreted ECCentricity error (?)
    as ECC error, and perhaps the mistake has been propagated without
    challenge???

    - Franc Zabkar
     
    Franc Zabkar, Apr 8, 2010
    #1
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  2. Franc Zabkar

    Grant Guest

    Particularly as run out would manifest as errors?

    Grant.
     
    Grant, Apr 8, 2010
    #2
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  3. Franc Zabkar

    Arno Guest

    Makes sense to me.

    Arno
     
    Arno, Apr 8, 2010
    #3
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