2009/5/26 Andrew Burgess [off-list ref]:

On Tue, 2009-05-26 at 13:59 +0100, Jeremy Sanders wrote:

quoted

Strangely, the Reallocated_Sector_Ct is still zero on the drive even though
Current_Pending_Sector is now zero. This is a Samsung HD103UJ by the way.

That can be ok. It probably tried writing and then rereading and when
that worked it decided the sector didn't really have a 'hard' error
(like a physical defect on the platter) and thus didn't need to be
reallocated to a spare sector. You could generate an unreadable sector
during a write by the power failing or with excessive vibration.

I have a question, in this situation, if I do as Jeremy did, write
zero to bad block to make drive think it is not bad any more, then
what about old data? Isn't it lost?

That said, the drive firmware could also be broken

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