Thread: Scratch disk?
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Even emptying the scratch disk can still not clear enough memory for your large files. I've run into this problem also. I work with 700 MB layered files. I was told the only #1 way is to shut down your computer. That wipes every thing clean (well memory usage wise). Only open Photoshop & things should go fine. However this isn't always possible. Starting up or shutting down apps also does not help since a "building block" effect happens with the memory. At least with the older hard drives. Chaning scratch disk or Cache preferences can bite you in the butt later or interfere with other apps/ or you have to constantly change them back and forth.

Here's what I did: I bought a 1 TB external hard drive.

Go to Photoshop > Preferences > Plug-Ins & Scratch Disks. Under scratch disk there is an area marked first, second, third & fourth. First has a drop-down to "starup". Under second, place an externial hard drive. It will use that when your computer runs out of memory. I have not run into a problem since. Photoshop is like a huge hungry relative that doesn't know how to stop. Hope that helps...