The scratch disk full error stops Photoshop mid-edit and can even prevent it from opening at all. Understanding what a scratch disk actually is — and knowing where to look — makes the difference between a quick fix and repeated frustration.
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These steps address the most common causes of the scratch disk error, from freeing space on the correct drive to adjusting settings that reduce demand over time.
- Check the Scratch Disks panel first to confirm which drive Photoshop is using — free space on other drives does not help unless that drive is selected.
- Aim for at least 100 GB free on your primary scratch drive, as Adobe recommends this as a baseline for troubleshooting the error.
- Assign a fast, dedicated drive as your scratch disk if storage on your main drive is consistently tight — an external SSD works well for this purpose.
- Quit and relaunch Photoshop if the warning returns during a session, since working allocations can build up even after closing documents.
- Lower your History States count in Performance preferences to reduce scratch disk demand, keeping in mind you will have fewer undo steps available.
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