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I want to encrypt my new external hard drive so it would be readable/writable on any computer I plug it in. Can I do that?

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You can try truecrypt it's supported both by windows and linux.. –  karthick87 Dec 24 '10 at 18:46

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up vote 3 down vote accepted

You could also consider installing Truecrypt on your USB. Once installed, use TrueCrypt to create an encrypted container, which can be opened with the software on the key. Saves you time installing software on multiple computers, still leaving you with the encryption you wanted.

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Thanks for the answer @Phinx, that should work fine.. –  Ondrej Sotolar Dec 26 '10 at 20:57

Truecrypt is probably your best choice, though you'll need to be able to install the software on any computer you want to use.

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