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I've looked around for a tool like ccrypt for partitions but to no avail. In fact I came across a thread on this forum that simply stated it wasn't possible. Why can't you encrypt existing partitions? Or is there a way to do it?
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You should look at TrueCrypt. You can use encrypted containers where are essentially encrypted partitions that can also be hidden. TrueCrypt supports on-the-fly disk encryption, this may be what you are looking for.
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