26 Jul
2007
26 Jul
'07
6:40 a.m.
From: "Chuck Guzis" <cclist at
sydex.com>
On 25 Jul 2007 at 20:43, dwight elvey wrote:
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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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