I just got a new 250 gig la cie firewire external drive and I'm a bit excited (sad isn't it) to get it up and running. I was going to create three partitions but I just thought that maybe it would be a good idea to creat a dedicated Photoshop scratch partition for it. Should I do this or just let photoshop continue to use the internal disk. If I do create a scratch partition, what is a good size. Is five gig too much or too little?