Windows 8 and 8.1 Forums


System process at 100% activity on OS HDD

  1. #1


    England
    Posts : 19
    Microsoft Windows 8.1 Pro x64

    System process at 100% activity on OS HDD


    The process "System" is showing in task manager to be using 100% of the HDD (100% activity, not storage) and running from anything between 5MB/s to 60MB/s. This is causing real problems for me as often programs will just stop responding because System is hogging the disk and they can't load anything. If they don't stop responding all together, they'll be reaally slow! I've attached a picture of disk activity on C for proof of what's happening. It'll happen for hours on end and then just stop all of a sudden. Sometime if I really need to get something done I'll have to restart my vomputer to get it to stop. As I said, this is causing my large problems. Does anybody have any idea how I can fix this? It doesn't seem like normal behaviour at all.

    Click image for larger version

      My System SpecsSystem Spec

  2. #2


    Canada
    Posts : 1,950
    windows 8.1 Update 1 Pro 64bit


    Are you able to see in the processes tab anything that is running high?
      My System SpecsSystem Spec

  3. #3


    England
    Posts : 19
    Microsoft Windows 8.1 Pro x64


    Quote Originally Posted by Nuccii View Post
    Are you able to see in the processes tab anything that is running high?
    Yes, System.
      My System SpecsSystem Spec

  4. #4


    Canada
    Posts : 1,950
    windows 8.1 Update 1 Pro 64bit


    In services.msc is superfetch enabled or disabled?

    Run also chkdsk /r
      My System SpecsSystem Spec

  5. #5


    England
    Posts : 19
    Microsoft Windows 8.1 Pro x64


    Quote Originally Posted by Nuccii View Post
    In services.msc is superfetch enabled or disabled?

    Run also chkdsk /r
    Superfetch is running and startup is automatic.
    I ran a third party disk "fixer" yesterday on every drive in my PC and they all came up clean. The utility I used is called HDD Regenerator. chkdsk /r implies /f and /f fixes errors on the disk, so if I'm correct I do not need to run chkdsk..?
      My System SpecsSystem Spec

  6. #6


    Posts : 1,121
    Windows 8.1 x64


    If it is still happening, open the Resource Monitor (resmon.exe) and look at the Disk Tab. Then put a check mark next to System. That will filter the listing in the other windows to just that one process. Then check and see which process shows with the high Reads/Writes and where it is reading to or writing from.

    Give it some time to scan for changes, maybe a couple of minutes. If you see high activity on one entry, or a high response time, that would be a clue.
      My System SpecsSystem Spec

  7. #7


    Canada
    Posts : 1,950
    windows 8.1 Update 1 Pro 64bit


    No need to chkdsk. Does the cpu usage calm down after a while?

    Uninstall AVG Free and reboot. AVG at times uses 100% of CPU even when not scanning

    Edit: Sorry meant HD usage
    Last edited by Nuccii; 30 Jun 2014 at 15:53.
      My System SpecsSystem Spec

  8. #8


    England
    Posts : 19
    Microsoft Windows 8.1 Pro x64


    Quote Originally Posted by Nuccii View Post
    No need to chkdsk. Does the cpu usage calm down after a while?

    Uninstall AVG Free and reboot. AVG at times uses 100% of CPU even when not scanning
    Do you man HDD usage? If not, CPU usage isn't the problem here.
      My System SpecsSystem Spec

  9. #9


    England
    Posts : 19
    Microsoft Windows 8.1 Pro x64


    Quote Originally Posted by Saltgrass View Post
    If it is still happening, open the Resource Monitor (resmon.exe) and look at the Disk Tab. Then put a check mark next to System. That will filter the listing in the other windows to just that one process. Then check and see which process shows with the high Reads/Writes and where it is reading to or writing from.

    Give it some time to scan for changes, maybe a couple of minutes. If you see high activity on one entry, or a high response time, that would be a clue.
    It's calmed down a bit now but I'll do that next time I notice it's happening and report back here with the results. Thank you!
      My System SpecsSystem Spec

  10. #10


    England
    Posts : 19
    Microsoft Windows 8.1 Pro x64


    Quote Originally Posted by Saltgrass View Post
    If it is still happening, open the Resource Monitor (resmon.exe) and look at the Disk Tab. Then put a check mark next to System. That will filter the listing in the other windows to just that one process. Then check and see which process shows with the high Reads/Writes and where it is reading to or writing from.

    Give it some time to scan for changes, maybe a couple of minutes. If you see high activity on one entry, or a high response time, that would be a clue.
    High writes are coming from the page file and the NTFS volume log.
    High reads are coming from C:\Users\*myname*\AppData\Local\ATI\ACE\Profiles.xml and the Page file and Also the "NTFS Free Space Map"
      My System SpecsSystem Spec

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System process at 100% activity on OS HDD
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