Photoshop not using designated drive for Scratch Space

Question

Hi all!

long time photoshop user here - I've had issues lately where photoshop uses a lot of temporary space on my main hard drive (c:/) and will sometimes try to "overfill" my computer. I've tried setting the scratch space to a different, external drive (d:/) , but it is still putting temporary on C:/

Last night being a particularly bad case, where I had over 100gb of free space on my C:/ (remember scratch is set to D:/ and the drive IS connected and functional). Set a batch of photos to denoise over night and come back to 0gb space, unable to save any of my work, and had to restart my computer. Which erased the temporary data and now I have my space back...

Has anyone been able to fix a similar problem?

D Fosse · Answer

Not at my machine to check now, but many functions use the system pagefile, not the scratch disk. That's the case for Denoise, which doesn't run under Photoshop at all, but under ACR/Lightroom - and in the GPU at that, which has its own memory management. When the GPU runs out of VRAM it uses shared system memory, which goes to system pagefile when exhausted.

The pagefile is always on C but can probably be moved in Windows.

It's easy to check that Photoshop uses the correct scratch drive (other than C). At the root of the drive you'll find "Photoshop Temp<12 digit number>".

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