Scracth disk is full
The Photoshop scratch disk is your hard drive. Photoshop uses your
hard drive as temporary "swap" space, or virtual memory, when your
system does not have enough RAM to perform an operation. If you only
have one hard drive or partition in
your computer, then the scratch disk will be the drive where your
operating system is installed (the C drive on a Windows system).
You can change the scratch disk location and add multiple
scratch disks from Photoshop Preferences. Many power users like to
create a dedicated hard drive partition for the Photoshop scratch disk.
Although Photoshop will function with a single scratch disk on the
system partition, you can improve performance by setting the scratch
disk to be the fastest drive in your system. Other useful guidelines
for setting scratch disks are to avoid using the same drive where your
operating system is installed, avoid using a drive where the files you
edit are stored, and don't use network or removable drives for a
scratch disk.
If Photoshop is shut down improperly or crashes in the middle
of an editing session, this can leave fairly large temporary files
behind on your scratch disk. Photoshop's temp files are typically named
~PST####.tmp on Windows and Temp#### on Macintosh, where #### is a
series of numbers. These are safe to delete.
If you're getting an error message that the scratch disk is
full, it means you need to clear some space on whatever drive is
defined as the scratch disk in Photoshop Preferences, or add additional
drives for Photoshop to use as scratch space.
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