Hi, I have a new mac pro with 4 int hard drives (the original boot drive and 3 x 1TB int hard drives). How should I configure the the drives for photoshop scratch disk? I intend to have the three int hard drives as a single striped RAID for all my data storage. Can I use the data storage RAID as the scratch disk or is it bad practice to have thesame disks that I'm storing files on as the scratch disk? Should I have a dedicated internal disk as a scratch disk? Or, will an external HD connected via a eSATA port be adequate for a scratch disk? Thanks.