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>This happens on files that are only around 60gb with about 5-7 layers.
I am guessing that you don't really mean 60 GB ?!
Have you tried putting your Scratch on a separate partition on a single (non-RAID) internal HD?
And even though you have 16GB of RAM, you might try turning back the memory allocation in Photoshop to 90%
Both Ann and Pierre are right. Lower the RAM allowance.
If you get used to think of it in terms of memory allowance, which it is, rather than RAM allocation, which it is not, it will be easier to remember that it represent the maximum amount of available memory that is left after the OS and other running applications and processes have grabbed whatever memory they need.
Setting at 90%, you're still allowing Photoshop to access well over 10, 12 or more GB of RAM, more than it can actually use. But you're not "allocating" or "reserving" any amount of RAM, you're only telling Photoshop not to use more than 90% of whatever is available at any given time.
Surely you agree that's reasonable?
Thanks all, lowering the ram allocation has seemed to work so far. Is CS4 using ram differently than CS3? I have seen test's showing that if you have over 4gb of ram you should have it at 100%, and I have had my CS3 set to that since it first came out and I never had this issue even working on files that are over 1gb. Oh ya, Ann is correct, my first post should have said 60mb not gb.