I have multiple OS on my machine (debian, ubuntu and windows) I already have ubuntu and windows disks encrypted separately.

I'm thinking about backing up all my data and reinstalling everything this week end, I want to know if there's a way to encrypt my entire disk instead of encrypting each OS.

I don't know how to do a hardware-based full disk encryption (from the wiki page this may be the solution to my answer), I know the risks of doing such operation I just don't have enough information to start with. How to know if my HDD supports it ?

It would be very helpful to have any documentation about this process.

Edit :

My HDD is not compatible with hardware-based full disk encryption. I've found this https://security.stackexchange.com/questions/14227/multi-boot-with-full-hard-drive-encryption-and-pre-boot-authentication but not sure if it's still relevant. Could it be the answer to my issue ?

  • Windows and Linux, while both supporting full-disk encryption, do so in separate and incompatible ways, and (that I'm aware) there's no cross-compatibility. If you want to be able to boot both OSs, I think you need to encrypt the Windows with Windows' method, and Linux with Linux's method. – Tom Hunt Nov 5 '15 at 17:45
  • that's what I already have, but a pre boot encryption is better (google search says that it's possible but it's very complicated) – enzo Nov 5 '15 at 17:56
  • I'm not sure what you mean by a "pre-boot encryption". The solution described in the security.stackexchange post uses the multiple forms of encryption as I suggested, though I'm not sure if Truecrypt is still best recommended. – Tom Hunt Nov 5 '15 at 18:19

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