Check hard disk for read errors. There are utilities to perform full disk scan, regardless od encryption state.
If you get errors, different recovery is required.
Can I use sector level scan and repair tool on encrypted hdd. will it harm encyption/sectors ?
for exp: SPINRITE its dos base scaning tool. can I use?
Repair? What if unreadible sector cannot be "repaired"?
I use HDTune under WinPE (BartPE) to perform disk surface scanning. If too many blocks are marked red (let say more than 5), disk is sent to clean room recovery.
You do this test before authorize and autheticate with Wintech or after ?
as i also have to run this type of test on one hdd.
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Doesn't matter. Do it before WinTech disk mount, otherwise additional corruption might occur.
Disk scanning is done at disk sector level, not file system level.