What's Scratch Disk in Photoshop?

A scratch disk is a hard disk drive or SSD used for temporary storage while Photoshop is running. Photoshop uses this space to store portions of your documents and their history panel states that don't fit in the memory or RAM of your machine.

How do I empty the scratch disk in Photoshop?

Here's how to get it done.
  1. Launch Photoshop and click Photoshop on the menu bar.
  2. Go to Preferences > Scratch Disks.
  3. 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.
  4. Click OK to proceed.

What does scratch disks are full in Photoshop mean?

If you encounter a 'Scratch disk full' error, it often means that your hard drive (or drives) used as scratch disk is (are) running out of storage space required to perform a task.

James H. Sterling

James H. Sterling

Environmental Science & Climate Journalist

James Sterling reports on renewable energy developments, climate policy, ecological conservation, and green tech innovations around the globe.