....
The location of block allocation bitmaps never gets changed, so this sort of thing only happens due to hardware-induced corruption.
Well, unless e.g. some modified sectors start being flushed to random wrong offsets, like in [1] above, or something similar.
Or cutting the power in the middle of SSD 'wear levelling'.
I've seen a completely trashed disk (sectors in completely the wrong places) after an unexpected power cut.
David
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