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Suggestions for backing up floppies with read errors?

Posted: Sat Mar 23, 2019 9:58 am
by EdVoncken
Hi,
I’m trying to back up all my 5.25” floppies, written on my Beeb with 8271 and Watford DFS 1.43a back in the day.
The discs do not appear to be mouldy; I’m using the DataCentre IMPORT/EXPORT commands to back up to USB .ssd images but it seems some discs have developed read errors.

Is there a method / software that can help recover the readable bits of each floppy? Perhaps ignore the read errors?

Thanks!

Re: Suggestions for backing up floppies with read errors?

Posted: Sat Mar 23, 2019 12:01 pm
by CMcDougall
one word, UPURS 8)

Re: Suggestions for backing up floppies with read errors?

Posted: Sat Mar 23, 2019 12:11 pm
by lurkio
EdVoncken wrote:
Sat Mar 23, 2019 9:58 am
Is there a method / software that can help recover the readable bits of each floppy? Perhaps ignore the read errors?
Have a look at DiskToUSB too:
:idea:

Re: Suggestions for backing up floppies with read errors?

Posted: Sat Mar 23, 2019 12:18 pm
by MartinB
As Colin says, UPURS has various old disc recovery options but importantly, unlike most systems it can be commanded to ignore unreadable tracks when it will continue reading the disc but will pad the image of any bad tracks with dummy data. Hence, you often end up with a still fairly complete image if the original has only a few bad tracks.

(Note though that UPURS is DFS only.)


.

Re: Suggestions for backing up floppies with read errors?

Posted: Sun Mar 24, 2019 9:16 pm
by EdVoncken
Thanks for the suggestions,

I will start by looking at UPURS. Interesting to see how much data can be recovered that way; I have some old school reports on those floppies ;-)

Re: Suggestions for backing up floppies with read errors?

Posted: Sun Mar 24, 2019 9:48 pm
by danielj
The other options are flux-level readers, like the kryoflux, that will dump everything and rely on PC-side software to decode them (and you get an idea from the visualisations as to where the issues lie). These also read through any errors. The kryoflux is expensive, but there is a much much cheaper option here:
http://cowlark.com/fluxengine/

d.

Re: Suggestions for backing up floppies with read errors?

Posted: Mon Mar 25, 2019 12:06 pm
by EdVoncken
danielj wrote:
Sun Mar 24, 2019 9:48 pm
... The kryoflux is expensive, but there is a much much cheaper option here: http://cowlark.com/fluxengine/
Ooh - this tickles my geek-senses ;-) I may just have to build one of these...