Read error correction in software

[dwight elvey]

>From: "Chuck Guzis" <cclist at sydex.com>
>
>On 25 Jul 2007 at 20:43, dwight elvey wrote:
>
>
> > If you take the calculated crc with the recorded crc, it can be
> > played backwards. When you get close, the end numbers in your
> > CRC back calculator will be zeros and the bits in the middle will
> > be the error mask.
>
>I'd thought of that, but most of the error sectors have more than a a
>single error (the content is mostly ASCII, so single bit errors are
>easy to correct by inspection).  Multiple MFM errors, what with bit
>and clock/data phase shifting etc. just don't seem to be amenable to
>that sort of approach.  Maybe I'm missing something...
>
>Cheers,
>Chuck
>

Hi Chuck
Your right, not too good on multiple errors.
You might be looking at a drive issue. Have you tried taking
the disk out and putting them back in after shifting them
in the envelope? ( I'm assuming they're floppies )
Dwight

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