Always keep 20–50 GB free on your main drive, or set a dedicated external SSD as the primary scratch disk.
Here’s a short, helpful piece you can use—whether for a blog, troubleshooting guide, or social media caption. Scratch Disks Are Full? Fix Photoshop on Mac in 5 Steps scratch disks are full mac photoshop
Need a quick win? Start with Step 2—changing the scratch disk to an external drive solves the issue instantly for most Mac users. Always keep 20–50 GB free on your main
Few things stop a creative workflow faster than Photoshop’s dreaded alert: scratch disks are full mac photoshop