This is an interesting comment, but it drastically oversimplifies the state of the art. An actually-good Wikipedia article:<p><a href="http://en.wikipedia.org/wiki/Disk_encryption_theory" rel="nofollow">http://en.wikipedia.org/wiki/Disk_encryption_theory</a><p>The short answer is, "use a well-known full disk encryption product, and don't worry about cipher modes".