Suggestions for backing up floppies with read errors?

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EdVoncken
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Suggestions for backing up floppies with read errors?

Post by EdVoncken » Sat Mar 23, 2019 9:58 am

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!
BBC-B (my first computer, 1983/1984?), Electron (1985? virtually unused)
BBC-B and BBC Master 128 with DataCentres from Mark@RetroClinic (2018, 2019)
Refurb/upgrade projects: BBC-B (2x), BBC Master 128 from eBay and Marktplaats

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CMcDougall
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Re: Suggestions for backing up floppies with read errors?

Post by CMcDougall » Sat Mar 23, 2019 12:01 pm

one word, UPURS 8)
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lurkio
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Re: Suggestions for backing up floppies with read errors?

Post by lurkio » Sat Mar 23, 2019 12:11 pm

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:

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MartinB
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Re: Suggestions for backing up floppies with read errors?

Post by MartinB » Sat Mar 23, 2019 12:18 pm

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.)


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Last edited by MartinB on Sat Mar 23, 2019 12:21 pm, edited 1 time in total.

EdVoncken
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Re: Suggestions for backing up floppies with read errors?

Post by EdVoncken » Sun Mar 24, 2019 9:16 pm

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 ;-)
BBC-B (my first computer, 1983/1984?), Electron (1985? virtually unused)
BBC-B and BBC Master 128 with DataCentres from Mark@RetroClinic (2018, 2019)
Refurb/upgrade projects: BBC-B (2x), BBC Master 128 from eBay and Marktplaats

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danielj
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Re: Suggestions for backing up floppies with read errors?

Post by danielj » Sun Mar 24, 2019 9:48 pm

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.

EdVoncken
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Re: Suggestions for backing up floppies with read errors?

Post by EdVoncken » Mon Mar 25, 2019 12:06 pm

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...
BBC-B (my first computer, 1983/1984?), Electron (1985? virtually unused)
BBC-B and BBC Master 128 with DataCentres from Mark@RetroClinic (2018, 2019)
Refurb/upgrade projects: BBC-B (2x), BBC Master 128 from eBay and Marktplaats

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