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Old 28 June 2011, 00:57   #5
prowler
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Quote:
Originally Posted by Supamax View Post
Interesting...! Did you manage to correctly read tracks/sectors not readable (giving errors) by an Amiga floppy drive?
Not quite. The KryoFlux Disk Tool Console (DTC), a 32-bit Windows command line interface, is able to capture data from every sector of Amiga floppy disks, except those with a missing sector header (and I've not found any other way of reading those). This means that it is capable of capturing data from flaky sectors which give a different result every time. To see what I mean, try re-reading a flaky sector using DiskMonTools.

Using KryoFlux, I am able to capture the data from flaky sectors numerous times, compare them and slowly build up a picture of what the sector really looks like. This can be done on a maximum likelihood basis for every byte in the sector and, if this doesn't prove accurate enough, it can be done at the bit level. It's rather like doing a jigsaw puzzle. If the sector checksum is intact, then it's possible to check your progress with a program like TrackEd, recalculating the checksum as you go.

Its laborious, but when you've already recovered something like 99% of a batch of nearly 200 disks, like I have with the AlienBash code disks, then it's worth going the extra mile to get the final 1%.

Quote:
Originally Posted by Supamax View Post
Did you use a proprietary program/method of yours, perhaps working on the raw dumps? Or using the software by SPS?
(sorry for the "noob" questions, but I know very little about the KryoFlux's software and its actual capabilities...)
KryoFlux's DTC captures a minimum of one Track from which I extract the 512 bytes comprising the sector I'm interrested in. Then I compare pairs of sectors from different captures using a binary comparator program which highlights the differences between them, and first I record those bytes which match with greater certainty, then move on to those which match most times and so on. Sometimes huge chunks match on just a few captures and these have proved to be very reliable. I am quite experienced at this, and a lot of it comes down to instinct.

To learn more about the KryoFlux's software and its capabilities, you can download the latest KryoFlux driver archive from the KryoFlux home page which contains a lot of useful information:
http://www.kryoflux.com
http://www.kryoflux.com/download/kryoflux_1.0b10r3.zip

Last edited by prowler; 28 June 2011 at 01:26. Reason: Typo.
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