SMART attribute #203 -- Run Out Cancel


F

Franc Zabkar

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
 
G

Grant

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???
Particularly as run out would manifest as errors?

Grant.
 
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