I thought about that and then thought what if you run into someone who really IS savvy enough to think, "Maybe this encrypted partition is a front." So I came up with another idea. Make the drives look smaller than they really are. Partition say 20-25% of your space as an innocuous unencrypted partition with home movies or whatever. Then conceal the good stuff in the second partition, which you can set so your system doesn't give it a drive letter. That way, when it's plugged in, it looks like a perfectly ordinary external hard drive. Programs like TrueCrypt and DiskCryptor can see the partition table and locate the unlettered partition which means you can still mount it when you're alone.