I finally replaced the hard drive in my mid-2010 MacBook Pro i5 with 750gb 7200 RPM Hitachi HDD. Now that I have a lot of Hard Drive space, I was thinking of making a second partition just for Final Cut Pro. I would only install a barebone Mac OS X Lion on it and not keep FileVault on. I was wondering if others have done this and if there were any suggestions on how much space to set aside? I'd like to just leave enough for the OS and Application to run at full performance. The footage I'd be importing to an external drive that would be connected via FireWire 800. Ideally I'd like to keep FileVault 2 set-up for that external so I Don't have to worry about losing it and having any sensitive footage be gone. But if that would mess up the performance a lot then I'll just leave FileVault 2 off on that external.