Windows 10 runs slow and freezes. Almost always 100% disk usage

My computer freezes often when booting and while it’s working it functions very slowly. Cpu usage is almost always very low (3-30%), memory usage is very consistent (60-80%), but disk usage is almost always 100%.

My main drive is a ST100DM003 HDD. I’ve run chkdsk and it found no problems. I’ve run CrystalDiskInfo and it says everything is fine. I’ve run SeaTools and every test seemed to pass (except for one while I was defragging, but I think that was a fluke because I ran it again after the defragging finished and there were no problems). I also ran CrystalDiskMark, and the results are below.


CrystalDiskMark 5.2.2 x64 (UWP) (C) 2007-2017 hiyohiyo

  • MB/s = 1,000,000 bytes/s [SATA/600 = 600,000,000 bytes/s]
  • KB = 1000 bytes, KiB = 1024 bytes

    Sequential Read (Q= 32,T= 1) : 30.303 MB/s

    Sequential Write (Q= 32,T= 1) : 16.670 MB/s

    Random Read 4KiB (Q= 32,T= 1) : 0.606 MB/s [ 147.9 IOPS]

    Random Write 4KiB (Q= 32,T= 1) : 0.375 MB/s [ 91.6 IOPS]

    Sequential Read (T= 1) : 32.929 MB/s

    Sequential Write (T= 1) : 20.340 MB/s

    Random Read 4KiB (Q= 1,T= 1) : 0.321 MB/s [ 78.4 IOPS]

    Random Write 4KiB (Q= 1,T= 1) : 0.444 MB/s [ 108.4 IOPS]

  • Test : 1024 MiB [C: 35.1% (325.3/926.1 GiB)] (x5) [Interval=5 sec]

  • Date : 2017/08/12 18:48:37
  • OS : Windows 10 [10.0 Build 15063] (x64)