5 Replies Latest reply on Apr 19, 2016 8:38 AM by michaelt14983923

    94 GBs used by Lightroom on my C: Drive

    Clark711 Level 1

      I have two computers with Lightroom CC 2015 installed.   One is Windows 10 - W10, and the other is Windows7Pro - W7P


      Both computers have the same setting for the Lightroom Cache.    In Preferences - FileHandling, both computers have this settings.


      C:Users\Me\AppData\Local\Adobe\CameraRaw\Cache -   1.0 GB max


      @ ! !

      However, in my W7P computer, I have this path


      C:Users\Me\AppData\Local\Adobe\Lightroom,  that has 94.1 GB of cache.


      And I'm running out of space on my C: drive.


      On my W10 computer, that same path has only 4.1  GB of space used.


      If I do need 94.1 GB of space for Lightroom's cache files,  then I would like to move them to an external HD.   How would I do that ?


      So, two questions,

      1) why so much on one (94.1 GB) vs 4.1 on the other ?

      2) How do I move that 94.1 GB requirement to an external HD ?





        • 1. Re: 94 GBs used by Lightroom on my C: Drive
          ssprengel Adobe Community Professional & MVP

          The LR cache folder isn’t the Camera Raw cache folder.  The CR Cache folder contains information about the demosaicked raw files that both LR and PS/ACR use when doing adjustments to raw images. 


          The LR cache folder contains several subfolders for different purposes.  The most troublesome is:


          C:\Users\username\AppData\Local\Adobe\Lightroom\Caches\Video\Media Cache Files


          which is added to whenever you do an Import from somewhere that has video files.  For each video file on the prospective Import path AND its subfolders, there will be a large audio file (cfa) and a small pek (peak) file.  This helps speed up video conversions in LR, but the problem is that any folder you click on while you’re navigating to your Import source will see all the video files under it even if you never import them.  In other words if you click on C:\ when navigating to your destination, then all the video files on your entire C drive will get cache data built for them.  And this data seems to stay there unless you manually remove it.  I’d suggest you delete everything in the Media Cache and Media Cache Files subfolders and see if it comes back.


          Since this cache data is built when you import and not when you work on the photos, the difference sizes are because different video files have existed on your import sources on the two computers.

          • 2. Re: 94 GBs used by Lightroom on my C: Drive
            Clark711 Level 1



            Thank you.  That was all very good information.


            I took your recommended actions early today, but waited to make sure that I did not have any surprises as the day progressed.    I deleted all files in the Media Cache and the Media Cache Files subfolders.    Almost 100 GB worth.


            Those folders are still empty several hours later, even though I have worked in Lightroom probably 2 hours today.    But I have not performed an import, which would likely have brought those folders back into play.


            I guess that means that I need to purge those folders after a period of importing ?   Assuming I import across folders that have video files in any of their subfolders?  


            There is no way to change the destination folder for those cache files?   To possibly a large USB HD ?


            Thanks once more. 



            • 3. Re: 94 GBs used by Lightroom on my C: Drive
              ssprengel Adobe Community Professional & MVP

              You cannot specify where this cache is, no.


              However, you can delete what's in it via the LR interface, it's only the size limit doesn't have any effect for files placed there during the Import scan, because a non-LR process is what's putting the files there, the DynamicLinkMediaServer.exe  It is possible to rename/delete the executable to stop videos from being parsed into that location during Import, but then your video processing may not work as well, I'm not sure.  I rarely do videos in LR.

              • 4. Re: 94 GBs used by Lightroom on my C: Drive
                Agent_Anise Level 1

                I just bought the LR 6 for Mac, and the Video Cache Settings area you've highlighted in the screen shot does NOT work. On my Mac, the maximum setting was 3.0 GB while the directory (which I had to hunt for methodically sizing each sub directory until I narrowed down the culprit) had 202 GB of video cache files. The LR app is NOT abiding by caching size set in this dialogue. Clicking the "Purge Cache" button did nothing. Directory size remained at 202 GB.


                From my searching, this is a known and huge bug in the LR software. Very nearly killed my hard drive last night, caught the process with only 25GB free space on my Mac hard drive.

                • 5. Re: 94 GBs used by Lightroom on my C: Drive
                  michaelt14983923 Level 1

                  I had the exact same issue on my Window 10 desktop.  It nearly killed my Smaller Solid state drive (C:) even though I was storing my catalog and files on separate hard drive (D:), I never realized it created this massive video file cache on the main C:  Drive.  I did "purge" the within the LR Preferences section and it seemed to remove the cache files with no problem.