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If you mean encrypting a non-empty partition, you can't. First you need back up your data, then follow the instructions. http://wiki.archlinux.org/index.php/Tru … cal_volume
I don't think there's other encryption software which can encypt a partition with data on it.
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There are two encryption techniques. Check the wiki (search for - yep, encryption!) to see which is more suitable for you.
never trust a toad...
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