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I am using TrueCrypt's 'Full Disk Encryption' and according to TrueCrypt's FAQ I should 'Permanently Decrypt System Partition/Drive' before reinstalling Windows. This does not make any sense to me. Would reinstalling Windows not undo the encryption in the first place?

The reason I would like to know, is because 'Permanently Decrypt System Partition/Drive' will take a long time.

Note: If the system partition/drive is encrypted and you want to reinstall or upgrade Windows, you need to decrypt it first (select System > Permanently Decrypt System Partition/Drive). However, a running operating system can be updated (security patches, service packs, etc.) without any problems even when the system partition/drive is encrypted.

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3 Answers 3

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I wouldn't have a clue why you would first need to do a full decryption. It might be that this is a feature for people who are using an OEM version of windows that comes with a special recovery partition. I'd just install windows over your encrypted drive, I don't think that will give you any issues.

The same of course for upgrades for obvious reasons.

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Reading the FAQ in question the TrueCrypt folks are trying to explain relates to reinstalling Windows on a system with a data volume encrypted that you wish to keep. The idea is that even though you don't reformat that volume the details needed to access it are lost in the Windows installation and thus the data is no longer recoverable.

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Generally when you install windows you format the hard drive so I can't see a need to worry about or decrypt the partition (unless there is data you'd like to get to before installing).

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