I've seen several people who record WoW videos says they get best results playing the game from one hard drive and recording the video to another hard drive. That's PC.

Is the same true for Mac? I'm guessing it is but if someone **knows** for a fact and can confirm I'd like to know.

If I would get significantly better performance - what does my setup need to be? I have an Imac so I don't think I can just pull the cover off and slap in another HD like with a PC. Are external hard drives capable of being as fast or fast enough?