When I used PowerShadow I remember it always asked at boot time if I want a partial or full system virtualization. I am planning to implement full disk encryption. When the preboot authentication asks me for the passphrase how can I choose if I want to boot in virtualized or non-virtualized fully encrypted OS? This may sound silly to somebody, but it confuses me a bit and I want to make sure I do it properly. Anything else to consider when combining full disk encryption and virtualization?