I recently upgraded the SSDs in my air and my wife's macbook. So now we have an extra 320 gb hard drive laying around and I was thinking about using it for movies and time machine backups. Currently this drive is a clone of her original drive. If I want to do this should I make 3 partitions? one for both time machine backups and one for dvds? Or should I just delete everything on the drive and start ripping dvd's? I have my OSX on my old 64 gb drive that was in my air.