Some folks call that "full disk encryption", but since there's a separate feature in TrueCrypt that calls itself "full disk encryption" and is actually encrypting the entire disk, to the point where TrueCrypt has to supply a boot loader to decrypt, it's probably reasonable to want to differentiate the two.

Thomas doesn't see the difference because it's all "block level" encryption, and apparently the only thing in the world that matters is crypto (rather than the presentation and adoption of crypto), but the difference is mainly in the boot loader aspect.