Basically, when I go to preferences, It only lists my C: and D: drive, but not my E: drive, and I really need to save what I'm working on. However, Photoshop is only using my OS Drive and System Reserve (C: and D:). Thing is, I have Hundreds of gigs free now because I tried uninstalling literally hundreds of programs while trying to chip away at my project slowly, while every time I work on my project, I get two steps in and then I get hit with the Scratch Disks are full message. I know, I did the silliest thing possible, but I had to clear up that space later anyways. So how do I add my E: drive into the preferred Scratch Disks? Thanks.
Here's some information on setting up a scratch disk. Remember it's NTFS for Windows and OSX Extended for the Mac or Photoshop won't detect them.
Manage your disks in Preferences > Scratch Disks.