[Coco] Rainbow on disk RAID

[John Guin]

How big is a sector on one of these disks?  And is a sector as small a unit as the corruption is manifested?

And then, how hard would it be to 'brute force' a routine to develop every conceivable sector value and try them until one works?  (This assumes there is no checksum anywhere that could make this much easier)?

With today's hardware, even if there were billions of possible sectors, I can't see that presenting too much of a challenge.  Heck, now that I think about it, this could be a project for BOINC or similar - "Help try combinations of values to restore old floppy media for legacy computers."

Of course, validation correctness would be a problem.

John

-----Original Message-----
From: Coco [mailto:coco-bounces at maltedmedia.com] On Behalf Of Melanie and John Mark Mobley
Sent: Tuesday, February 17, 2015 11:36 AM
To: coco at maltedmedia.com
Subject: [Coco] Rainbow on disk RAID

Key
RoD (Rainbow on Disk)
RADE (Redundant Array of Independent disks)

Error recover of RoD.

RoD RADE => If we had 3 copies of each disk then we could select the sectors that match 2 out of 3 or 3 out of 3 and recover any errors.
If 2 out of 3 sectors match then use one of the  matching sectors.

Then we can recover from disk errors.  There is hope that we can preserve this information even if the disk are starting to fail, but we need to act soon.

John Mark Mobley



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