7 Replies Latest reply on Jan 18, 2012 2:13 AM by PECourtejoie

    How to use RAM as scratch disk

    LarryM01 Level 1

      Hi,

       

      I am very uncertain about this.

       

      I have a PC with RAM 20GB, Win 7 64 bits. Photoshop CS4.

      I have set a hard disk partition as a primary scratch disk.

      In the Preferences I have available RAM: 18488 MB

      I let Photoshop use 13000 MB (70%).

       

      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.

       

      It seems that my Photoshop uses the hard drive as the scratch disk.

       

      I thought that Photoshop automatically should use extra RAM as a scratch disk.

       

      Have I forgotten to do some setting, or is this the normal behaviour?

      How can I force the scratch disk to happen in RAM?

       

      Thanks

       

      /LArry

        • 1. Re: How to use RAM as scratch disk
          Level 4

          LarryM01 wrote:

           

          …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…

           

          Perfectly normal, expected behavior.

           

          Photoshop always uses a scratch disk, from the very instant you open an image file or create a new document.  Always.  No exceptions.

           

           

          LarryM01 wrote:

           

          …I have set a hard disk partition as a primary scratch disk…

           

          If that's a partition of your boot drive, it's futile and you're much better off leaving the boot drive unpartitioned so as to not limit either the Photoshop scratch disk or the OS swap files.  There's nothing to gain because the OS swap files and Photoshop's scratch disk are still competing for the use of the one set of read/write heads.

           

          Bad move.  You're just potentially limiting either the Photoshop scratch disk or the OS swap files.

           

           

          ____________

          Wo Tai Lao Le

          我太老了

          1 person found this helpful
          • 2. Re: How to use RAM as scratch disk
            Grant H Level 4

            It seems that my Photoshop uses the hard drive as the scratch disk.

            correct... PS uses a harddrive as a scratch disk...

             

            G

            • 3. Re: How to use RAM as scratch disk
              the_wine_snob Level 9

              Though written for video editing, this ARTICLE on Partitions will have much, that will apply to work in PS with Images too.

               

              Partitons are basically a hold-over from a time, when the OS's could not address larger HDD's. With the possible exception of a dual-boot system, or a very few automatic backup schemes, they actually cause more problems, than they solve.

               

              Separate, physical HDD's will improve things all around, and should also contribute to the life-span of your HDD's.

               

              Good luck,

               

              Hunt

              • 4. Re: How to use RAM as scratch disk
                Level 4

                Right… partitions, shmartitions

                 

                 

                ____________

                Wo Tai Lao Le

                我太老了     

                • 5. Re: How to use RAM as scratch disk
                  Noel Carboni Level 8

                  As I mentioned in your other thread, are you finding something wrong with just using the 64 bit edition oF Photoshop, which can make use of all that RAM directly?

                   

                  Perhaps you could describe what you're trying to accomplish?

                   

                  -Noel

                  • 6. Re: How to use RAM as scratch disk
                    Jeff Arola Adobe Community Professional

                    More reading material:

                    Optimize performance | Photoshop CS4, CS5

                     

                     

                    http://kb2.adobe.com/cps/404/kb404439.html

                    • 7. Re: How to use RAM as scratch disk
                      PECourtejoie Adobe Community Professional

                      Yes, the primary location of Photoshop's memory is the Smart disk, usually, an hard drive.

                      But the info is cached on memory (for faster access)

                      Even if the info will be replicated on the hard drive, Photoshop will still use the memory as a cache (a temporary, faster location), 13 gigs in your case.

                      As scratch files can grow to become huge, the hard drive is used, and could fit as big a scratch as the location you give it.

                      If you want to speed up Photoshop scratch disk, if you cannot add more memory, adding an SSD as a scratch disk might help, as described in the document linked by R_Kelly.