Most people make the mistake of having one hard drive just for installed programs/games.The problem is, is that some games/apps will only install to the C drive and can't be changed.
? Can you give examples? I've *never* run into that problem with Windows - that's what the 'advanced' option is for with program setup. Granted, I'm not a hardcore gamer, but I do have 10+ years with setup/maintenance on systems for both home and small business users.
The only time I can recall that it's been an issue is when installing specific (definitely *not* mainstream) Windows programs on a Linux setup.