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My windows pc's disk usage goes to 100% when idle(when pc screen is off and running chrome,photos,etc. not more than 3 apps.) and when I wake the screen it hangs(might be hanging when screen is off also as i cant see it) and then after 10s the disk usage comes back to normal and I get a notification Saying there are disk errors(chkdsk). After shutting it down as normal on next boot it does a chkdsk.

Sometimes it doesn't force me to do a chkdsk and boots up normally.

Is it a faulty disk? I also ran chkntfs and it show c: is dirty.

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  • Sounds like Windows' maintenance tasks are running, and a faulty disk causes this issue. I would backup the data first, then check the SMART info and if necessary replace the disk.
    – LPChip
    Commented Oct 11, 2021 at 7:14
  • You need to find which process is using the CPU. Let it run in idle for some time, then in Task Manager, Details tab, right-click the headers, choose Select columns, and add "I/O reads" and "l/O writes" for cumulative data. I would also do a deep antivirus scan.
    – harrymc
    Commented Oct 11, 2021 at 10:13
  • There's definitely no viruses cause I ran a deep scan recently. I also noticed that sometimes out of the blue "system" or "sysmain" starts using around 70% disk.
    – User not found
    Commented Oct 11, 2021 at 11:48

1 Answer 1

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My windows pc's disk usage goes to 100% when idle

You may prevent this from happening by going to Control Panel > Hardware and Sound > Power Options > Edit Plan Settings > Change advanced power settings. Then, under Hard Disk > Turn off hard disk after, enter higher values (e.g. 60 minutes) for both On battery and Plugged in.

Is it a faulty disk?

You may go to File Explorer. Right click your (C:) disk and click Properties > Tools > Error Checking > Check. If it shows You don't need to scan this drive, you can safely ignore the notification. Otherwise, scan the drive and wait for the result. If it reports problems, you need to replace the disk.

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  • Why would the stopping of the hard disk affect it? And it was set to 20min but it used to hang after just about 2-3mins (does not always hang sometimes hangs while using). Now I've set both to 60 mins.
    – User not found
    Commented Oct 11, 2021 at 12:06

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