I had a very old Win 10 version, I upgraded to a new one, new one was messed up, screen wouldn't work well and system was completely unresponsive. So I did a fresh installation from a USB, latest Windows version 1709, it worked fine, until yesterday. It's not a problem with the HDD because it works fine on Ubuntu and worked fine on the previous Windows.
The problem: Computer turns extremely slow, practically unusable, task manager shows 100% disk usage, but there are no apps using it.
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I have tried disabling superfetch, Windows Defender, updating drivers. Nothing worked. Like I said, there are no processes using the disk, not superfetch, nor system or anything else.
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I have tried using resmon but it didn't show any processes using the disk, Process Explorer didn't even show the 100% usage.
I have noticed that the problem only happens if I let my computer idle for a couple of minutes, even without it going to sleep or letting the screen dim. If I actively use the computer, the problem doesn't happen.
Best Answer
The
Current Pending Sector Count
is causing your perf issue:So you have 100 unstable sectors where the HDD tries to read the data and store the data somewhere else.
So backup the data and replace the HDD with a new drive. Best is to buy a SSD which is faster.