Scratch disks act as virtual RAM (albeit, slow RAM) after Photoshop has used real (wired) RAM. Adobe recommends that users set their scratch disk to the largest available internal drive on your system.
After reading Jeff Tranberry’s article, How to tune Photoshop CS6 for peak performance, I decided to change the order in which my scratch disks are utilized. Bad move, because as it turns out, I received the following error dialog:
Photoshop could not open scratch file because disk not available.
In the past, I assumed that I’d have to wipe out all my preferences to revert to my original scratch disk selections. Today, I discovered a much better way…
Read on to learn more…
Holding down Command+Option while launching Photoshop will let you reconfigure your Scratch Disk settings.
There is no need to delete all your Photoshop preferences. I’m still trying to figure out why my revised scratch disk settings yielded the error in the first place, but at least it’s good to know that I can switch scratch disks on the fly if I need to.
As far as why my new scratch disk settings didn’t take, my hunch is that it has something to do with permissions on my other internal drives.
Thoughts? Tips? Share ’em in the comments below!