Totally understand what you mean, But what you are describing is a partitioned system NOT a dual boot system
A dual boot system allows two operating systems to be installed onto a machine. So for example, XP and Vista (not that anyone would want vista imo 
). so that each of them can be loaded seperately.
Partitioning is different,
Partitioning usually entails one hard disk split into multiple disks (on a software level, Not like slice the HD up and offer it with a brew )
If i remember correctly there was an article in computer music magazine years ago about this but here’s what i remember
Firstly,
install your operating system on the drive
then, create a partition for the DAW (depending on the on the size of the drive 20GB will suffice)
Install your DAW, VST’s etc on that partition
Next, Create another partition so that your sample library can be put on it,
and finally make a partition of the "free" space for Counterstrike and Half life 2.
and thats your lot!
**Disclaimer** Obviously, altering partitions can affect the data that is allready stored on them so i would suggest backing everything up (or just go for that format).
Hope that helps 
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