100% Disk Usage by System and Compressed Memory

100% Disk Usage by System and Compressed Memory is an error that may occur when you mess with the virtual memory settings and accidentally change the paging file size. It may also occur when the System and Compressed Memory process simply fails. The error may cause computers to become incredibly slow.

The error has been reported in Windows 10.

Staff Asked on November 18, 2018 in Microsoft Windows.
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4 Solution(s)

Solution 1. Disable Superfetch/Prefetch

“100% Disk Usage by System and Compressed Memory” could be caused by the Windows service Superfetch. This Windows service sometimes uses too much disk read and writes and it is noticeable when you are still using a hard disk drive (HDD). Note, Superfetch is not a virus or a malware, it is a Windows application that store often uses data to your memory to be load easily when you use the data again. To fix this, upgrade your storage device to a Solid State Drive (SSD) which has higher read and write speed than the HDD, add an additional memory / RAM stick, or disable Superfetch. To disable it Superfetch see instructions below.

  1. Click CTRL key + ALT key + Delete key.
  2. Select Task Manager.

    RE: 100% Disk Usage by System and Compressed Memory

  3. Click the Services Tab and click Open Services.
  4. In the Services window, look for  Superfetch.
  5. Right-click Superfetch, then select Properties.
  6. in the Superfetch Properties window, select Disable in Startup type.
  7. Click Apply and then OK.
  8. Restart your computer.
Staff Answered on November 19, 2018.
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Solution 2. Disable Virtual Memory

Setting too much virtual memory might cause “100% Disk Usage by System and Compressed Memory.”  You may want to set it back to its default settings.

  1. Click Windows Start, type in performance and press Enter.

    RE: 100% Disk Usage by System and Compressed Memory

  2. In the Performance Option, click the Advanced tab and click Change.
  3. In the Virtual memory window, check Automatically manage page file for all drives.
  4. Click OK.
  5. Click Apply and then click Ok.
Staff Answered on November 19, 2018.
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Solution 3. Test Hard disk drive or your Memory / RAM

If the “100% Disk Usage by System and Compressed Memory” this persist your Hard disk drive or your Memory / RAM might have a problem. Try to test the credibility of your hardware, it could be the source of the problem if it is failing. To test the hardware, please see below.

For the Hard Disk Drive

For the Memory / RAM

See instructions here on testing Memory / RAM.

If the hard disk drive and the memory / RAM are tested good. It is possible your Windows is corrupted, please see solution 4. 

Staff Answered on November 19, 2018.
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Solution 4. Reset Windows

If the hardware test in Solution 3 resulted in good condition, probably your Windows has the problem resulted to “100% Disk Usage by System and Compressed Memory”. It could be a corrupted pagefile.sys. To solve the problem, try to restore Windows to its default without deleting your Data. See instruction below.

  1. Click Window Start, in the search bar type, Reset this PC and then press Enter key.

    RE: 100% Disk Usage by System and Compressed Memory

  2. The press Get Started.
  3. Click Keep my files.
Staff Answered on November 19, 2018.
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