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the data in the bad sectors will be gone for sure, but nothing else.
remember, Windows has no functions to validate writes to the disk - it just writes the data and assumes the drive will work it out as it goes. There's simply nothing in Windows to do anything more (thus all products which use the disk do nothing more either). The only way to get write validation is to use something like RAID5 which does indeed check CRC's against the copies of the data spread over multiple disks.
it's a common misunderstanding that writes are checked, simply, they are not (in Windows anyway).