Recently, I bought Plextor M5 Pro with hardware full-disk AES-256 encryption. Installed it in my laptop, where I have no HDD BIOS password set. From what I read around it seems that the encryption is invisible for the OS and the HDD BIOS password is useless if my laptop get stolen. The AES-256 encryption keys are stored on the drive itself.
What I would like to know is how to configure the built-in encryption. How to make sure my data is protected?
The OS, although irrelevant in this case, is Ubuntu 12.04, 64-bit. The laptop is HP Compaq nc4400. The BIOS has master password set, but no HDD one.