I'm already familiar with transferring Steam games from one hard drive to another, but is this possible to do with Starcraft 2? Starcraft 2 is a huge download and I already have it installed on another hard drive, I was wondering if it would be possible to transfer this one as well.
A straight copy-paste of the whole installation folder should work. If you want to copy user-specific data as well, it should be in (My) Documents/Starcraft II.
Blizzard is actually really good about making their installations copy/pastable. Don't remember about the original Starcraft, but Warcraft III, WoW and SC2 can all be moved by just copy/paste on the whole installation directory. Any registry stuff is recreated on the new machine if it doesn't already exist (Not sure if it's updated if there's an old installation)