Hello friends! 👋
Are you trying to edit an image in Adobe Photoshop, but suddenly you see the message:
"Could not complete your request because the scratch disks are full."
This is one of the most common Photoshop errors, especially when working with large images, multiple layers, RAW files, or complex design projects. Many users assume their computer is out of storage, but that's not always true.
A scratch disk is temporary storage that Photoshop uses as virtual memory when your computer's RAM isn't enough for the current task. If this storage becomes full or unavailable, Photoshop may become slow, refuse to open files, or stop working altogether.
The good news is that this error is usually easy to fix. In this guide, you'll learn what a scratch disk is, why the error appears, and the best ways to solve it without losing your projects.
💡 My Experience
While working with Photoshop on systems having limited storage, I've seen this error appear most often after editing high-resolution images or opening many large PSD files at once. In almost every case, Photoshop itself wasn't the problem—the issue was simply a lack of free space on the drive being used as the scratch disk.
Another common situation occurred after reinstalling Windows. Photoshop continued using the system drive as its scratch disk even though a larger secondary drive was available. Changing the scratch disk location and freeing up unnecessary files solved the problem immediately.
Because of experiences like these, I always recommend checking available disk space before reinstalling Photoshop.
What Is a Scratch Disk?
A scratch disk is a hard drive or SSD that Photoshop uses as temporary working space when RAM is insufficient.
Photoshop stores temporary data such as:
Undo history
Large image data
Temporary edits
Cache files
Complex layer information
The faster and more spacious the scratch disk, the better Photoshop can perform.
Why Does the Scratch Disk Full Error Occur?
Common causes include:
The scratch disk has no free space.
Too many temporary Photoshop files.
Very large PSD or PSB files.
Limited available RAM.
The wrong drive is selected as the scratch disk.
Windows temporary files consuming storage.
Multiple Adobe applications running simultaneously.
Before You Start
Before making changes:
Save your Photoshop work if possible.
Close unnecessary applications.
Restart the computer if Photoshop is unresponsive.
Ensure you have administrator access if changing system settings.
Step 1: Check Free Disk Space
Open File Explorer.
Locate the drive used by Photoshop (often C:).
Check how much free space is available.
For smooth performance, it's generally recommended to keep tens of gigabytes of free space available, especially when working with large projects.
Step 2: Delete Temporary Files
Press:
Win + R
Type:
%temp%
Delete temporary files that are no longer needed (skip any files Windows reports are currently in use).
You can also use Windows Disk Cleanup or Storage Sense to remove unnecessary temporary data.
💡 My Recommendation
If your computer has both an SSD and a larger secondary drive, consider using the SSD for Photoshop only if it has enough free space. Otherwise, assigning a spacious secondary SSD as the scratch disk can improve stability when working on large projects.
Step 3: Change the Scratch Disk
Open Photoshop.
Go to:
Edit → Preferences → Scratch Disks
Select a drive with:
Plenty of free space
Good performance
Reliable health
Apply the changes and restart Photoshop.
If Photoshop won't open, many versions allow you to access the Scratch Disk selection by holding the appropriate modifier keys immediately after launching the application. Refer to your Photoshop version's documentation for the exact shortcut.
Step 4: Clear Photoshop Cache
Within Photoshop:
Review available options for:
Purging history
Clipboard
Cache-related temporary data
Only clear items you're comfortable losing, as some actions cannot be undone afterward.
⚠️ Note
Purging Photoshop's history or clipboard removes temporary editing information. Save your work before using these options if you may need to undo recent changes.
Step 5: Reduce History States
Photoshop stores multiple undo levels.
Reducing the number of History States can lower scratch disk usage during long editing sessions.
Adjust this setting only if it suits your workflow.
Step 6: Close Unused Documents
Large Photoshop documents consume significant memory and temporary storage.
Close projects that you're not actively editing to reduce scratch disk usage.
Step 7: Optimize Photoshop Performance
Within Photoshop Preferences:
Review settings related to:
Memory usage
Graphics processor
Cache levels
Performance
Proper configuration can reduce unnecessary scratch disk activity.
Step 8: Check Disk Health
If the scratch disk is nearly full or performing poorly:
Verify available storage.
Check the drive's health using trusted diagnostic tools.
Consider replacing an aging drive if it shows signs of failure.
Step 9: Update Photoshop
Install the latest Photoshop updates.
Updates often include:
Bug fixes
Performance improvements
Better compatibility with newer Windows versions
Restart Photoshop after updating.
Step 10: Reset Photoshop Preferences (Last Resort)
If the error continues despite sufficient disk space:
Reset Photoshop preferences.
Be aware that this restores many settings to their defaults.
Common Causes and Solutions
| Problem | Solution |
|---|---|
| Scratch disk full | Free up storage space |
| Wrong scratch disk selected | Choose another drive |
| Too many temporary files | Delete temporary files |
| Large PSD files | Close unused documents |
| Limited RAM | Reduce workload or upgrade memory if appropriate |
| Corrupted preferences | Reset Photoshop preferences |
| Outdated Photoshop | Install updates |
How to Prevent Scratch Disk Errors
Follow these best practices:
Keep plenty of free disk space available.
Clean temporary files regularly.
Close projects you're not using.
Save and restart Photoshop during long editing sessions.
Store completed projects on another drive.
Update Photoshop periodically.
💡 Pro Tip
If you frequently edit large RAW photos, multi-layer PSD files, or high-resolution graphics, using a fast SSD with ample free space as your scratch disk can significantly improve Photoshop's responsiveness and reduce the likelihood of scratch disk errors.
Image Suggestions
Include screenshots of:
Scratch Disk Full error message.
Photoshop Preferences → Scratch Disks.
Windows Storage settings.
Temporary files folder.
Disk Cleanup utility.
Performance Preferences.
Photoshop working normally after the fix.
Quick Summary Table
| Step | Action |
|---|---|
| 1 | Check available disk space |
| 2 | Delete temporary files |
| 3 | Change the scratch disk |
| 4 | Clear Photoshop cache/history if appropriate |
| 5 | Reduce History States |
| 6 | Close unused documents |
| 7 | Optimize performance settings |
| 8 | Check drive health |
| 9 | Update Photoshop |
| 10 | Reset preferences if necessary |
Common Beginner Mistakes
Avoid these mistakes:
Assuming more RAM alone will solve every scratch disk issue.
Ignoring available free space on the scratch disk.
Storing large temporary files on a nearly full drive.
Forgetting to close unused Photoshop documents.
Deleting important project files while trying to free space.
Running many memory-intensive applications simultaneously.
Reinstalling Photoshop before checking storage.
Interesting Facts
Photoshop uses scratch disks as virtual working space when RAM isn't sufficient.
Large PSD and PSB files can consume significant temporary storage.
SSDs generally provide much better scratch disk performance than traditional hard drives.
Scratch disk usage varies depending on image size, bit depth, layers, and editing operations.
Keeping your storage drive healthy benefits many creative applications, not just Photoshop.
Best Practices
Maintain adequate free storage on your scratch disk.
Back up important Photoshop projects regularly.
Use fast storage for active editing work.
Keep Windows and Photoshop updated.
Monitor disk health if you work with large creative projects frequently.
Conclusion
The "Scratch Disk Full" error in Photoshop is usually caused by insufficient temporary storage rather than a software defect. By freeing disk space, selecting an appropriate scratch disk, cleaning temporary files, optimizing Photoshop settings, and maintaining healthy storage, you can resolve the issue and keep Photoshop running smoothly.
Start with the simplest solutions first, and only reset preferences or reinstall Photoshop if the problem persists after verifying your storage configuration.
Frequently Asked Questions (FAQs)
1. What is a Photoshop scratch disk?
A scratch disk is temporary storage that Photoshop uses when it needs additional working space beyond your computer's available RAM.
2. Why do I get the "Scratch Disk Full" error even though my computer has free space?
Photoshop may be using a specific drive as its scratch disk. If that drive is nearly full, you'll still receive the error even if another drive has plenty of available space.
3. Can I use an SSD as a scratch disk?
Yes. A fast SSD is generally an excellent choice because it offers much better performance than a traditional hard drive.
4. Will deleting temporary files help?
Often, yes. Removing unnecessary temporary files can free space and resolve scratch disk issues.
5. Does adding more RAM eliminate the need for a scratch disk?
Not completely. Even systems with large amounts of RAM may still use scratch disks during complex editing tasks.
6. Is it safe to change the scratch disk location?
Yes, provided you choose a healthy drive with sufficient free space and follow Photoshop's settings correctly.
7. Should I reinstall Photoshop if I see this error?
Usually not. Most scratch disk errors are related to storage configuration rather than problems with the Photoshop installation itself.
