Photoshop CS4 does NOT use RAM as scratch disk

Photoshop CS4 does NOT use RAM as scratch disk
as far as I can tell.
I have 20 GB RAM and still Photoshop uses the hard disk as scratch disk.
(OS = Win 7 64).
Can I force the use of RAM as scratch disk?
/Larry

Hi PECourtejoie,
I really try to understand this, please.
I don't know if 'Hitting the hard disk brings unacceptable slowdowns in my workflow'.
Because I don't know what unacceptable slowdowns are.
Any operation in Phshp takes time, and you always want it to go as fast as possible..
I know that if Phshp only worked against RAM instead of constantly saving to (and reading from) the hard drive it ought to go faster.
But I still don't know if this is the case, because there is a constant use of a tempfile on the hard drive's Scratch disk!
So far I understand that Phshp may BOTH work in RAM AND save data to the hard drive Scratch disk.
It could be possible that the writing to the hard disk happens when Phshp is idle from other tasks and that the reading only happens when data has disappeared from the Cache in RAM.
That could be a scenario where a Scratch disk on Hard drive doesn't interfere with Phshps performance, and an explanation why we should not bother about the Scratch disk on the hard drive.
But I would very much like to have some confirmation on this, IF this is the explanation of how the Scratch disk on a hard drive works without influencing Phshp's performance??
Everybody just seem to assume that Photoshop uses (some) parts of RAM as work space - I just need a better understanding of this. And some correct descriptions.
/Larry

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Hi,
I am very uncertain about this.
I have a PC with RAM 20GB, Win 7 64 bits. Photoshop CS4.
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I let Photoshop use 13000 MB (70%).
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…Every time that I do something on a picture in Photoshop the size of the Photoshop temporary file on the hard disk scratch partition grows…
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…I have set a hard disk partition as a primary scratch disk…
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