No, no idea. But my favorite guess is cosmic rays (a discussion a while back about data corruption, data structure, it's storage on hard drives, and speculation on the cosmic ray striking just the right place at just the right time gave birth to this guess!
The MFT has 2 copies with one being the backup - so this makes the cosmic ray theory extremely unlikely (as it requires 2 cosmic rays striking the drive to make both copies bad at the same time). It could be disk damage (such as a dying hard drive or dragging head). It could be a virus. It could be software corruption that rewrote the MFT's badly. Etc, etc, etc.
My browser caused a flood of traffic, sio my IP address was banned. Hope to fix it soon. Will get back to posting as soon as Im able. - John
(my website: http://www.carrona.org/
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