noob question:What are scratch disks???

when i try to do something to my car, (that already has stuff done to it) it says i cant do anything because my scratch disks are full...

what does that mean???

NEVERMIND, sorry for this post..
NO ONE REPLY

and if you do, then, w/e

AHH!!!
im so new, haha

ahaah ive been using PS for like a few months.. and i still dont know how to fix my scratch disk problem
lol

i just saved my chop as a jpg instead of a photoshop and then i did more work to the jpg version.

i dont know how to get rid of the problem on the original photshop copy of it though. haha