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Windows 10 is largely a reliable operating system, but one problem has plagued it since launch: the 100% disk usage bug. Resulting in system-wide hangs and freezes, the bug appears in various scenarios and is straightforward to resolve, if you know what you are looking for. One of the following fixes should resolve any Windows 10 100% disk usage bug whether your computer uses an HDD or SSD storage. 100% Disk Usage in Windows 10: Fixed!When the error was first discovered, only a few culprits were found. But as time passed, despite the 100% disk usage error being reported to Microsoft, more causes of this bug have been discovered. Click the link above for each possible cause of the bug to see how to fix it. Check the steps one at a time, referring to the Windows Task Manager after each to confirm whether the disk’s 100% usage has dropped and Windows 10 is back to normal. Even if you find a solution, a Windows Update could reset the changes you've made. Bookmarking this page will help you find it in the future and run through the fixes again. 1. Windows 10 100% Disk Usage Causing Slow Performance? Run Disk CheckThis performance issue is most obvious when attempting to use Windows Search to find a file or program, and anything else that requires the drive to do some work (perhaps copying and pasting a group of files). To establish whether it is a problem that is affecting you, when your computer next slows down, use Task Manager to run a disk check. First, press Ctrl+Alt+Del and select Task Manager (or right-click the Taskbar and select Task Manager, or hit Ctrl+Shift+Esc). Note that this may take some time to open with the drive being under strain.
On the Processes tab look for the Disk column. If you're having problems with drive performance, this will be at 100%, and shaded red to indicate whether you have a problem or not. Problem sectors on your HDD can cause the 100% disk usage issue in Windows 10. However, using Windows' built-in disk check can fix this:
Wait while the system scans the drive; a reboot may be required for a full disk repair. This should deal with the error. 2. Update Your Anti-Virus if Windows 10 Disk Is Running at 100%As with any performance issue, the first thing to do is confirm that your computer hasn't been infected with malware. Your security software should be able to deal with this, whether it's a free app or a paid suite. At the very least, tools like Malwarebytes Anti-Malware should be able to scan your system drive and detect any problems. Note that with a heavy load on your drive already this may take a while. If threats are found, use the software's recommendations to discard them and reboot. Next, check your drive's performance again. Hopefully, you've resolved the issue; if not, then malware wasn't to blame, so read on. 3. Windows Search Can Cause 100% Disk Usage in Windows 10The next thing to check is whether the 100% disk usage error has anything to do with Windows Search. A bug in Windows 10 results in a "search loop" that causes an increased load on the system drive. To stop this and prevent it from happening during your current session (until Windows is rebooted):
That should solve most issue. If there is no change, even after rebooting, you can permanently disable Windows Search and Indexing.
A few moments after disabling Windows Search, your Windows 10 performance should improve considerably. If not, move on… 4. Disable SysMain to Fix 100% Disk Usage in Windows 10Another Windows 10 feature identified as a potential cause of the 100% disk usage issue is the superfetch service. Since Windows 10 1809 (the 2018 Windows 10 October Update) this has been renamed to "SysMain." To prevent this service from causing the disk usage issue, open another Windows PowerShell (Admin) and enter:
Again, wait a few moments to check whether this has had any effect on your computer's performance. You should also run Check Disk in PowerShell:
You'll be informed that your PC must be rebooted for Check Disk to complete, so make sure you have closed all your applications first. If this doesn't work, it is likely that you're experiencing a frustrating iteration of this issue that is simple to resolve. 5. Is Flash Causing the 100% Disk Usage Bug?Flash remains one of the most vulnerable aspects of modern computing and should be disabled. Adobe killed off its multimedia plugin in 2020, so there's little reason to keep using it, especially as Flash seems to be one of the most common culprits for the 100% hard disk usage in Windows 10 with the Google Chrome browser. To disable Flash in Google Chrome browser:
The next thing to do is update to the latest version of Chrome. In most cases this happens automatically, but if not just go to Menu > Help > About Google Chrome and wait for the update to complete. If you can't see any of the options, don't worry. It simply means that your version of Chrome has already updated and no longer supports Flash. 6. Disk Usage at 100%? Switch Web BrowsersIt may not be Flash that is impacting on your browser performance. Another cause could be the browser itself, particularly if you're using Google Chrome. The obvious option is to choose a different browser. Windows 10 already has two browsers built in. You probably don't want to use Internet Explorer, but Microsoft Edge is an adequate replacement for Chrome. Several browsers are available, some better than others. 7. Disk at 100% Usage in Windows With SkypeAnother widely used application could also be causing your 100% HDD usage is Skype. In an era when online collaboration and video meetings is increasing, Skype is a likely culprit. Since Skype has been more closely integrated with Windows 10, it is a little trickier to deal with. What you can do, however, is stop Skype from running to help determine if it is the cause of the issues.
Head back to the Task Manager to see the change. You may also consider finding a Skype alternative. If the 100% disk usage bug tends to happen straight after Windows loads, it's a good idea to disable Skype from autoloading. Under Runs at log-in, change the switch from On to Off. Further issues with Skype can also be dealt with in this screen. You can Repair, Reset, and even Uninstall Skype to aid with your troubleshooting. 8. Has the PCI-Express Firmware Bug Resulted in Windows 10 100% Disk Usage?Some drivers don't run quite as they should in Windows 10. One that has been discovered to be causing 100% HDD use is the StorAHCI.sys driver, which has a firmware bug. StorAHCI.sys intended for storage devices connected to the PC or laptop motherboard via Advanced Host Controller Interface PCI-Express. To find out if this is the problem and rule it out:
If the driver listed as C:\Windows\system32\DRIVERS\storahci.sys, you could be affected by this bug. Next:
Here, expand Device Parameters\Interrupt Management\ MessageSignaledInterruptProperties and you should see MSISupported listed in the right-hand pane. Double-click this, then change the Value data: to 0. Click OK to confirm and follow the instructions to restart Windows. 9. Is Steam Causing 100% Disk Usage in Windows 10?Enjoy gaming and have Steam installed? There's a good chance this digital delivery system is causing 100% disk usage. Usually this is due to update delivery, causing the background downloader to get caught in a loop. Clear the Steam cache to fix this. First, make sure you have exited Steam. Where Steam is a likely cause of the 100% disk usage error, it may hang when you try to exit. In this case, use the Windows 10 Task Manager to close the software. Next, open the Win + R run box and enter
You'll see a dialogue box, informing you that content will be deleted.
Click OK to proceed. Note that games and saves will be retained, so there is no risk of them being deleted. 10. Disable Diagnostic Tracking in Windows 10 to Stop the Disk Reaching 100%Finally, it's worth considering the impact of diagnostic tracking in Windows 10. A feature that you might have otherwise disabled for privacy reasons, it has been blamed for 100% HDD use on many PCs. When it comes to reducing your hard disk drive usage, it's quicker to simply disable the DiagTrack service. If this is the source of the 100% disk usage error in Windows 10, you can stop the service launching. However, to do this you'll need to access Command Prompt in administrator mode.
When you're done, close the command prompt. You might also reboot Windows. 11. Windows Update Can Cause 100% Disk UsageAs well as affecting changes you make to your PC when fixing the 100% disk use problem, Windows Update can also be a cause. This usually only happens when Windows Update has a problem (which is typically due to a file refusing to download). You have two options here:
Once the update has finished downloading, it's wise to run it as soon as possible. Remember to check any previous fixes for 100% disk usage before proceeding; as noted above, Windows Update can reverse these fixes. 12. Reset Virtual Memory to Fix 100% Disk Usage in Windows 10Virtual memory is a combination of RAM and hard disk space and can be responsible for overuse of your HDD. If there isn't enough RAM to perform a task, the HDD is used to supplement the RAM. Data moved to the HDD is then returned to RAM when required. If you've made it this far, and you've yet to solve the 100% disk usage issue, it could be worth resetting your virtual memory.
These numbers can be confusing, so with the first value, rely on the recommended option. For the maximum value, aim for a figure no more than 1.5 times your system RAM. For instance, a computer with 4GB of RAM should have no more than 6.5GB (6144MB). The next step is to clear the temporary files that have been used in the previous virtual memory allocation.
13. Activate High Performance Mode to End Windows 10’s 100% Disk Usage BugWindows' standard power modes are prone to the 100% disk usage bug but switching to high performance often overcomes the problem. The downside, of course, is that your computer will use more power. Thanks to modern processor design this shouldn't be a massive issue. However, notebooks and desktop replacement laptops may take a hit on battery life. To change to high performance:
If this isn't a displayed option, you'll need to create your own custom power plan. Click Create a power plan, then choose High performance. Give the plan a name, tweak any personal settings you need then select it as a power plan to use. In a moment or two, the 100% disk usage issue should drop to less than 10%. 14. Disk at 100% in Windows 10? Install the Latest SATA DriversCould a storage device driver be resulting in the 100% disk usage error? Your Windows 10 computer almost certainly uses SATA connections for hard drives, SSDs, and optical drives. If the drivers aren't up-to-date, the disk usage error can occur. Avoid this by upgrading to the latest SATA drivers.
You may need to reboot Windows for this to take effect. Note that if it doesn't work, you can still try this by checking the manufacturer's website for a new driver. This can be installed using the instructions that accompany it. 15. Could Your PC's Power Supply (PSU) Cause 100% Disk Usage?There is a chance that your computer's hardware is causing the 100% disk usage issue in Windows: specifically, the PSU. If disk usage issues can be attributed to excessive disk activity, then it follows there might be a power-related cause. 100% disk usage has been spotted on Windows 10 laptops running on the battery. Once plugged into the power adaptor, the issue resolves. Similarly, the problem has been shown to alleviate once a new PSU is installed in a desktop PC. Check our guide to new PC power supply units to help you choose a replacement. 16. Windows Help Is Causing 100% HDD UseAnother issue that has been traced to 100% disk usage in Windows 10 is the operating system's built-in active help tool. You'll have noticed this feature that pops up when you're doing something for the first time with useful tips and suggestions. If you suspect this is causing a problem in Windows 10 with disk usage, you can disable it:
A few moments later, things should improve. 17. Is WaasMedicAgent.exe Slowing Down Windows 10?Incorrectly identified as a virus or malware, WaasMedicAgent.exe (part of the Windows Update Medic Service) is a Microsoft system process that checks downloaded Windows Update files. If there is a problem with the data, the files are downloaded again – a process that could leave your HDD at 100%. To fix this,
Disabling the update medic is an extreme step to take. However, it is one way to avoid Windows 10 disk usage hitting 100%. Disk Usage Should Rarely Be 100%There is no reason for Windows 10’s disk load to be anything close to 100%, under normal usage. A slow computer is one with a problem, and if you cannot fix it by disabling a browser plugin, stopping services, or running your antivirus software, then the problem may well be hardware related. Perhaps your drive is getting old; it may be defective, or the cables may need replacing. Try these fixes the next time your Windows computer slows down. Be sure to check your Windows Experience Index periodically to identify performance issues in need of immediate resolution. Why is my disk at 100 for no reason?If your drive is constantly working at or near 100% for no apparent reason, this might mean your computer is malware-infected. The stakes are high – thus, scan your PC right away to find out if some malicious invaders are attacking your system.
Is 100% disk usage normal?In general, your hard drive should never be at 100% usage, so if it is, there is some reason for the condition. You need to fix the issue or risk a very slow-moving computer. You can check your disk situation in the task manager and solve the problem in this post.
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