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I use my external HDD only with my laptop, which runs Windows 7. One of my friends tried to open it on another laptop with Windows XP.

The first two attempts, he faced an error saying "E: is not accessible" popped up.
On the third try, when he double-clicked on E:, his laptop asked him if he wanted to format the HDD. By mistake, he pressed 'Format', and, within 2 seconds, canceled the formatting process.

Now, when I use that disk on my laptop, it asks me for a key. After providing the key, BitLocker status changes from "Locked" to "On". But, when I double-click E:, it opens a window saying

E: is not accessible. The disc structure is corrupted and unreadable.

What should I do to open it?

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Windows XP does not support BitLocker and there is no way to add support. All data on the drive is gone. Because the drive is encrypted, you would have to provide the key, then you might be able to recover files although this is unlikely. I suggest in the future doing backups. –  Ramhound May 29 '12 at 14:17
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1 Answer

Bitlocker didn't corrupt the disc, formatting it did. I'd recommend just recovering from your latest backup. It's really not worth the trouble to try to repair this kind of damage.

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I dont have its backup. –  pd90 May 28 '12 at 13:10
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If the data wasn't worth keeping a backup of, it's definitely not worth recovering without one. –  David Schwartz May 28 '12 at 13:11
    
Recovering an encrypted drive? oh boy. –  Jeff F. May 29 '12 at 12:40
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