How To Identify Cause of 100% Disk Usage?

  1.    12 May 2018 #1

    How To Identify Cause of 100% Disk Usage?

    I have a win10 machine that keeps slowing down drastically and when I check with Task Manager I see there's 100% system disk usage.

    And I can't figure out what is causing it.

    And I can't understand how it could be that important that is would slow the machine.

    100% usage simply means that the disk is being accessed all the time doesn't it? That's all. It gets no rest.

    But CPU usage is fairly minimal. 97% idle time. Disk transfer rate is low.

    So I figure it must be something that can't operate unless it can access the disk and it simply can't access the disk.

    But all I am doing is browsing web pages. Reading them. Forum posts usually. And I might write a post. Not disk intensive activities.

    I look for I/O and page faults and find Firefox and Avira to be most heavy.

    Is there any way to identify which processes and therefore which applications are being delayed?

    I've got two machines with win10 and each set up pretty much the same and each used in about the same way.

    This one here now never gets this problem. That other one I've had endless problems with. It's an Asus H170 pro gamer. This one is an Asus H61-MK. Both Asus, see? Even that much similar.
      My ComputerSystem Spec

  2. Bree's Avatar
    Posts : 9,971
    10 Home x64 (1809) (10 Pro on 2nd pc)
       12 May 2018 #2

    abrogard said: View Post
    ...when I check with Task Manager I see there's 100% system disk usage.
    And I can't figure out what is causing it...
    In Task Manager, click the Processes tab. Now click the title 'Disk' at the top of the disk usage column. This will sort the processes in descending order of disk use and help you identify the culprit.
      My ComputersSystem Spec

  3.    12 May 2018 #3

    aaarggh... my god... right there before my eyes on the front page ! I've been giving it a quick glance and tearing past it looking for some kind of specialised in-depth page that will tell me....

    blinding myself with science...

    Brilliant. Well it seems to be Avast (not Avira i've got, but Avast). Hogs the limelight. Then Service Host Cryptographic and Diagnostic and Prefetch and Win Problem Reporting.....

    Avast right at the top of the list. I think I'll throw it out.

    This machine that works so beautifully and shows none of this congestion and commotion - it is showing zero disk use right now - doesn't have avast.

    So a big thanks for that.

    Any thoughts on the diagnostic suite?
      My ComputerSystem Spec

  4. Bree's Avatar
    Posts : 9,971
    10 Home x64 (1809) (10 Pro on 2nd pc)
       13 May 2018 #4

    abrogard said: View Post
    aaarggh... my god... right there before my eyes on the front page !

    ...Any thoughts on the diagnostic suite?
    Microsoft's own built-in processes seem well behaved and only seem to run flat out when the machine is idle. I wouldn't worry, they seem to get out of your way if you start using the PC. For me it's SuperFetch that can rattle the disk at 100% for a while, but it doesn't seem to affect performance when I need it.
      My ComputersSystem Spec

  5.    13 May 2018 #5

    You can use Spacesniffer to see where the large folders/files are.
      My ComputersSystem Spec


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