[Coco] Recovering Data from Bad Disks

[Luis Fernández]

Hi
In : http://www.nitros9.org/howto.html There is a utility called cocodisk, reading bad sectors and marks them with & HEB
If you read the original and the support I could easily place the good of the two sectors together


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Making  CoCoDskUtilPack V 1.1.3A.zip, Scan magazines and organize maltedmedia
http://cococoding.com/cocodskutil/ Thank Aaron Wolfe
http://www.tandycoco.com Thank Brian Blake and Stephen Fischer
My personal blog: http://www.luis45ccs.blogspot.com, 
Excuse my English, I use google translator, my language is Spanish, I'm Spanish but I live in Venezuela
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> Date: Fri, 22 Feb 2013 15:21:47 +0800
> From: cocolistemail at titaniumstudios.com
> To: coco at maltedmedia.com
> Subject: [Coco] Recovering Data from Bad Disks
> 
> I have a lot of old Coco disks and now that I have my Coco set up, I'm in
> the process of extracting the data off them. I am running Drivewire 4 in
> HBDOS mode and BACKUP 0 TO n creates a .DSK per physical disk which is
> exactly what I want.
> 
> However, many of them are bad, including everything that has any of my work
> on them. I do however have a backup disk for everything, but those two have
> a lot of bad disks too. I was thinking that if I extracted what I could
> from both versions and hex-diff the .dsk images, I should be able to
> recover a lot. I vaguely recall back in the day that there was software
> that would allow ignoring (checksum?) errors during copy and often you'd
> end up with only one bad byte. I have no idea what that was though. Does
> anyone know what I'm talking about?
> 
> Another option would be to write something myself that uses DSKCON as it
> would allow me to log out additional info such as which sectors were bad. I
> have a vague recollection though that the DSKCON routines don't give any of
> the sector data on error?
> 
> - Jayeson Lee-Steere
> 
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