Hi, When I try and open a large file in photshop, or perform a complicated function on that large file (once I get it to open), sometimes my PowerBook G4 won't let me because it says that my Scratch Disks are full. I appear to have 7Gb free (although it regularly drops down to as low as 500Mb, and I quikly transfer stuff onto my external hard drive). Do you have any ideas why this might be? As a sort of solution I tend to shut down all other programs, empty my trash etc and normally it'll let me do whatever I wanted to do. But there's no reason for me to do this because I have plenty of Gb free. As a side note I recently boogered up my computer and reinstalled the operating system a month ago - this may be relevant - I don't know. Cheers guys.