How to Repair 100% Disk Usage Issue on Windows 7 8/8.1 10

Last updated on 07/04/2017

This article guides you to resolve the problem when hard disk runs at 100% usage on different Windows like Win10/8/8.1/7/XP.

Some people have encountered the problem: hard disk is running at 100% usage on their computer running Windows, but they have no idea how the disk usage gets to 100%.

You will find this page helpful if you meet the same problem that Windows hard disk runs at 100% usage.

This page includes following useful contents:

1. Reasons for Disk Usage 100% Issue

2. Hard Disk Usage 100% Fix Windows

3. Windows 10 / 8 / 8.1 100% Disk Usage

4. Hard Drive Runs at 100 Percent Windows 7 Vista XP

Reasons for Disk Usage 100% Issue

Usually, you can check the disk usage on different Windows by opening Task Manager.

When disk usage is at 100%, it probably slow down your computer or even freeze up your PC and lead it to stop working normally. Here are possible reasons why hard disk shows 100% usage on Windows:

1. Hard disk drive failure

This problem sometimes occurs if you installed an old hard disk on your computer because old HDD usually cannot meet the demand of Windows. Sometimes, even if you installed a new hard disk, the problem also occurs because hard disk has failures.

2. Antivirus

Antivirus infect would lead disk space usage to be 100%, so you can run antivirus software to check if hard disk is attacked by virus, spyware or Trojan.

3. Windows Defender

Windows Defender is built-in antivirus software in Windows 10 and Windows 8. If you do something else when running Windows Defender to scan disk, the disk usage probably gets to 100% easily.

4. Windows HomeGroup

Windows HomeGroup would occupy lots of disk usage, so you can check if it is that you enabled Windows HomeGroup that causes disk usage to be high.

5. IPv6

IPv6 is the abbreviation of Internet Protocol version 6, which will occupy disk usage on Windows.

6. SuperFetch service

SuperFetch service is specially designed for enterprise application and large collaborative software. If you are home user, you do not need to open SuperFetch service on your computer.

7. Virtual memory reasonable

Virtual memory can increase burden of hard disk and occupy much disk usage though it is able to improve the performance of system.

8. More other reasons

On different Windows computer, the reasons might be a little different sometimes. You may meet the problem due to more other reasons under different Windows OS. Therefore, we will share solution for 100% usage in different Windows later.

Hard Disk Usage 100% Fix Windows

Following methods are available for all Windows including Windows XP, Vista, 7, 8/8.1 and 10 for 100% disk usage repairing:

1. Change a new hard disk

You can check hard disk for errors firstly. If hard disk is too old or gets corrupted, you can replace it with a new one. An SSD is better than a basic hard disk, so you can use SSD drive on Windows 10, 8 or 8.1 PC if possible.

2. Check virus

Run antivirus program to check virus and remove all viruses on your computer. Uninstall all possible malware and make your hard disk clean.

3. Delete temporary files and cookies

Try deleting all temporary files and cookies on your computer. You can also run disk cleanup to perform a disk cleanup to wipe unnecessary cookies and temporary files.

Windows 10 / 8 / 8.1 100% Disk Usage

100 percent of disk usage is a problem that frequently occurs in Windows 10, 8.1 and 8. If disk usage is at 100% on Windows 8/8.1/10, you can also try using following methods to fix it:

1. Check system for corrupted files

You can run CMD in Windows 10, 8.1 and 8 and type sfc/scannow to scan system for corrupted files, after which you can reboot computer to see if the problem can be fixed.

2. Disable Windows Defender

You can disable Windows Defender to decrease the disk usage following this guide: click "Start" menu > "Settings" > type "Defender" and find the "Windows Defender Settings" > turn off the "Real-time protection" and "Cloud-based Protection"

3. Disable Windows HomeGroup

You can disable Windows HomeGroup to decrease the disk usage on Windows 8 and its later Windows version following this guide: press "Windows" + "R" keys and type "services.msc" to open "Service" windows > find "HomeGroupListener" and "HomeGroupProvider" > select "Disalbe" option in "Startup type"

4. Disable IPv6

To disable IPv6 in Windows 10/8.1/8, you can right click the current internet and select "Properties" > unselect the "Internet Protocol Version 6 (TCP/IPv6)"

5. Optimize or disable Windows Search

According to our test, Windows Search does not occupy much disk space, so it is not necessary to disable Windows Search. However, you can optimize Windows Search for a better performance.

6. Disable SuperFetch service

You can follow the steps to disable SuperFetch service: type "Service" in Windows 10 Search box to open the "Service" screen > right click "SuperFetch" and select "Properties" > find the "Setup type" and select "Disable"

7. Reset virtual memory

You can follow the tutorial below to reset virtual memory:

Step1. Right click "This PC" and select "Properties" option > click "Advanced System Settings" > click "Advanced" tab and then click "Settings" button > select "Advanced" tab and choose "Change" button

Step2. Unselect the "Automatically manage paging file size for all drives" > select the system partition (usually C drive) and click "Set" button and then "Ok" button.

Step3. Set the virtual memory (the virtual memory should not be less than 2048MB)

8. Disable MSI mode

Some of the SSD drives may fail to input / output correctly in MSI mode if the SSD is running inbox AHCI driver (StorAHCI.sys), in which situation it may report disk usage running at 100%. Therefore, you can disable MSI mode to repair this problem:

Step1. Right click "This PC" and click "Device Manger" > open "IDE ATA/ATAPI Controllers" > right click "Standard SATA AHCI Controller" and select "Properties"

Step2. Click "Driver details" under "Driver" tab > you can see the "Driver File Details"

Step3. Close the "Driver File Details" and then click "Details" tab > select "Device Instance Path" and copy the value

Step4. Type "regedit" in Windows 10 Search box > open HKEY_LOCAL_MACHINE\System\CurrentControlSet\Enum\PCI\ \\Device Parameters\Interrupt Management\MessageSignaledInterruptProperties > double click the "MSISupported" and then change the value to 0.

Hard Drive Runs at 100 Percent Windows 7 Vista XP

For Windows 7 and previous Windows version, disk space usage 100% problem less occurs. In addition to common methods mentioned above, you can open Task Manager to check what occupy the disk space and delete or uninstall the unnecessary files or applications.


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