Nothing says you can't use Truecrypt or what have you on top of the hardware-based encryption built into the hard drive.
This way you'll have AT LEAST as much protection as you would've with just your software-based encryption.
Is it just me, or would this stuff work VERY well as a RADAR cloaking device?
1-18 GHz is solidly in the microwave (millimeter-wave RADAR anyone?) range...
Mod parent up please. This is an interesting point, and little understood or reported.