Scratch Disks a are full, help me use my external hard drive instead.
Hello,
My scratch disks are full and I keep bailing out all unnecessary files off my computer library but the notice keeps coming back! I want to use my external hard drive as my scratch disk instead of my computer's hard drive but it doesn't come up as an option when I go into Preferences to change my scratch disk. I've looked into this issue and it seems like I have to re-format my external hard drive to a weird format to make it a valid option that the computer recognizes. Is this a thing? (I'm on a Mac). Please help! I'm doing graphic design for a company and this is so frustrating!

