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#11
Just because the hard drive isn't bad doesn't mean it can't have corrupted sectors. Corrupted and bad sectors are two different things. Corruption is data related, whereas a bad sector is a hardware issue. And I believe you can still have a few bad sectors and still pass a hard disk diagnostic because the bad sectors are fixable/swappable. Obviously if a full format does not fix your issue, then you know it is probably a different piece of hardware causing the issue. I am just trying to narrow down possibilities.
Edit: It is also still possible that the data contained in the recovery partition was corrupted, even if the hard disk is fine and has no bad sectors. It could still have corrupted sectors.