Here is a nice setup:
1 WD 80GB 10,000 RPM Drive
-Windows Operating System Only
1WD 160GB 7,200/10,000RPM Drive
-Only Video Game Installs
1WD 320GB Drive 7,200/10,000RPM Drive
-Software Installations, Data Files, etc.
1WD 40GB Drive 7,200/10,000RPM Drive
Reading Documents, Tutorials, saved web pages, etc.
10TB+ 10,000RPM Drives (Not Needed )
-Data, Scratch Drives for Video/Photo/Sound Editing/Rendering
--These drives don't have anything on them and are used for Adobe's Scratch Storage ...and fill up really fast...