Here's how to get it done.
- Launch Photoshop and click Photoshop on the menu bar.
- Go to Preferences > Scratch Disks.
- In the Scratch Disk Preferences window, choose the external drive you want to use as the scratch disk and uncheck the built-in hard disk with low storage space.
- Click OK to proceed.
How do I empty my scratch disk in Photoshop?
If you want to clear a scratch disk from previous data altogether, you'll need to find the files to remove manually. Once there, find the file named Photoshop Temp followed by a string of numbers. This is the file that contains all the temporary data Photoshop uses when it boots up. Delete this file to clear it.
How do I empty my scratch disk without opening Photoshop?
If Photoshop cannot launch because the scratch disk is full, hold down the Cmd + Opt keys (Mac) or Ctrl + Alt keys (Windows) on launch to set a new scratch disk. I was able to reset the scratch disk and so far Photoshop is launching fine. Hope this helps someone!
