How to Fix 99 Disk Usage Complete Guideline

Have you ever noticed how your computer gradually becomes slower and slower? Programs take longer to open, the system feels slow, and occasionally the dreaded ‘not responding’ warning appears. Your hard drive is likely operating over time. Your PC is frantically attempting to keep up with all the data and programs vying for its attention when your disk usage soars to 99%. 

Don’t panic; you can stop your PC from slowing down and restore normal disk utilization right away by performing a few quick fixes. In this article, I’ll teach you how to identify the source of your disk space utilization and how to permanently reduce it to 99%. You’ll regain your productivity, your PC will function like new once more, and apps will launch quickly. So relax, take a beverage, and let’s get started; your quick computer is only a few clicks away! 

What Causes 99% Disk Usage?

What, then, is causing your PC to run slowly and your disk use to skyrocket up to 99%? There are a few typical offenders: 

Outdated or Faulty Drivers

High disk utilization is frequently caused by out-of-date device drivers. Expand each section in Device Manager and search for yellow warning icons. This suggests that the driver needs to be updated. Visit the website of the device’s manufacturer, download the most recent driver, and install it. Your computer should use less disk space after you restart it. 

Windows Update

Your disk utilization may reach its maximum since Windows Update frequently downloads and installs updates in the background. In Task Manager, you could notice that the “Service Host: Local System” process is taking up a significant amount of disk space. Click “Check for Updates” under Settings > Update & Security > Windows Update to resolve this. Restart your computer after installing any available updates. Once the updates have been installed, the disk utilization will revert to normal. 

Antivirus Software Scanning

Your PC is routinely scanned by your antivirus program for viruses, which momentarily pushes disk usage to 99%. Once an antivirus scan is finished, if one is underway, the disk usage will go down. Until your disk consumption problem is fixed, you might have to disable scheduled scans. 

Indexing Service

Your computer’s files are indexed by the Windows Search Indexing service so you may find them more quickly. One prominent reason for high disk utilization is this ongoing indexing. Go to Control Panel > Indexing Options to turn off indexing. Click OK after unchecking any drives or locations you don’t need to search. Your disk utilization ought to increase soon. 

You should be able to reduce your disk utilization to a reasonable level and speed up your PC by taking care of these few problems. If you have any further inquiries, please contact me! 

How to Check Your Disk Usage

You should examine your disk use to see how much of it is being used at any given time. This is how:

Ctrl+Shift+Esc will launch the Task Manager. Select “Open Resource Monitor” from the list of options under the Performance tab.


You can get a breakdown of your disk usage in this. Look at the “% Usage” column; if any drive is using 90 to 100% of its capacity for an extended period of time, your PC may experience a delay. 

Some possible culprits for high disk usage:

  1. Updates are being downloaded by Windows Update in the background. If you wait for it to finish, your usage should return to normal. 
  2. Running is a virus scan. Schedule the scan to run while you’re not using your PC by pausing or canceling it. 
  3. You have an excessive number of open tabs, particularly those that contain video or numerous photos. Unused tabs should be closed. 
  4. There is a malicious application. Close and restart an application if it is using a lot of disk space. Additionally, you can update obsolete software that might have memory leaks. 
  5. You have a failing hard disk. After attempting the aforementioned measures, if excessive utilization persists, it may be a sign of a hard drive malfunction, thus it is best to back up your files right away. The drive might need to be changed. 

You can keep your PC running quickly and avoid frustrating slowdowns by frequently checking how much space is being used on your drive and making space available when necessary. Monitoring any troubling usage patterns can assist in identifying additional possible issues before they become out of hand. You’ll remain productive and your data will be safe if you keep your disk in good condition. 

Fix Disk Fragmentation Issues

By distributing files across your hard drive and making it work harder to access them, disk fragmentation slows down your computer. Fragmentation accumulates over time and has a severe negative effect on performance. The good news is that repairing disk fragmentation is rather simple. 

Use the Windows Defragmenter program integrated into Windows to defragment your drive. Searching the Start menu will get it. Click “Analyze” after choosing your primary hard drive, which is typically C:. This will assess the drive’s fragmentation. It’s a good idea to defragment if it’s more than 10% fragmented. 

When you select “Defragment,” the process of consolidating empty space and rearranging your files will start. Depending on how big your hard disk is and how badly it has been fragmented, this could take some time. Till the tool is finished, let it run. 

You can speed up the process of defragmentation by doing the following: 

  • Shut down all other running programs before defragmenting. This allows maximum resources for the defragmenter.
  • Run a disk cleanup to remove temporary files and empty the Recycle Bin. This frees up more contiguous space to work with.
  • Defragment weekly or monthly to prevent buildup. An ongoing maintenance schedule is more efficient than waiting until performance is severely impacted.
  • Consider an SSD if fragmentation continues to be an issue. Solid-state drives don’t suffer from fragmentation like traditional hard disk drives.
  • Defragment individual folders and files. You can select specific areas of your drive to target if needed. This is handy for frequently accessed files like your documents folder.

By rearranging dispersed information and freeing up usable space, fixing a severely fragmented hard disk can drastically speed up your PC. You may minimize the effects of disk fragmentation and keep your computer working as effectively as possible by defragmenting frequently and improving the procedure. 

Clean Up Unnecessary Files

You must purge superfluous files from your hard disk in order to keep your PC operating quickly. Unused downloads, programs, and other things accumulate over time and slow down your computer. 

Clean Up Your Downloads Folder

All types of files frequently end up in your Downloads folder. Go over everything and remove anything you don’t need, including: 

  • Installation files for programs you’ve already installed
  • Temporary internet files
  • Unused photos, documents, or other media

To find older files quickly, you may also sort by file type or date updated. Consider altering your browser’s settings so that files are not downloaded to this folder automatically once you’ve cleaned it up. 

Uninstall Unused Programs

Programs you no longer use should be uninstalled. Too many unused apps on your computer can strain system resources and slow things down, especially if they run background activities. 

Sort the list of installed programs in the Control Panel by the date they were installed. Remove any software you haven’t used in six to twelve months. Be very careful not to remove any important software or drivers, like security programs. If in doubt, quickly search the web to confirm the program’s specifics before uninstalling. 

Run a Disk Cleanup

The Control Panel’s Disk Cleanup function assists in removing unnecessary files, temporary files, and system items that are using up space. In order to help you decide which files to delete, it will scan your drive and display how much space each type of file is occupying. 

Pay close attention not to delete things like:

  • Browser cache – This stores website data to speed up load times. Only delete if experiencing issues.
  • Recycle Bin – Empty this regularly to free up space.
  • Temporary internet files – These store data from websites you’ve visited to improve load times. Only delete if needed.

For your PC to operate as effectively as possible, running Disk Cleanup frequently—even once a month—will help maintain your hard drive clutter-free. Your computer will be up and running like new in no time if you combine these steps with uninstalling unnecessary downloads and programs.a

Upgrade Your Hard Drive

One of the greatest ways to speed up a sluggish computer and address high disk use is to upgrade your hard drive. Your computer needs to work harder to retrieve files and find free space as your hard drive fills up over time, slowing down everything.

Get an SSD

A standard hard disk drive (HDD) cannot compare to the speed of an SSD (solid state drive). SSDs can read and write data quickly because they don’t have any moving parts. Your computer’s performance and responsiveness can be significantly enhanced by swapping out your HDD for an SSD or adding an SSD as a boot disk. 

Move your operating system and programs to the new drive after installing an SSD. This enables speedy program access and boot-up on your computer. To conserve SSD space, keep your personal documents, images, videos, and music on the HDD. 

Increase storage space

If your hard disk is almost full, your computer will operate slowly as it tries to organize data and make room. You should either increase extra storage or eliminate unused files and unnecessary programs. Your computer has more room to work effectively if you upgrade to a bigger HDD or SSD or add a secondary disk. 

Select an SSD with at least 240GB to 500GB of capacity for your operating system and key apps when replacing your primary drive. To store files, an HDD between 1 and 4 TB is suitable. After installation, you might need to modify your BIOS so that it starts by booting from the new drive. 

Perform regular maintenance

To maintain your hard disk functioning properly, undertake routine maintenance in addition to upgrading your hardware. Utilize disk defragmentation and cleanup programs to clean up temporary data and arrange your drive. Using CHKDSK or a third-party program like CrystalDiskInfo, check for hard disk problems and faulty sectors. Enable drive encryption such as BitLocker to ensure the security of your drives. 

Stopping a sluggish PC and excessive disk utilization problems require upgrading and maintaining your hard drive. Your computer will operate more quickly and effectively for many years to come with an SSD, extra storage, and routine maintenance. 


Here are a few quick fixes to speed up your PC and get rid of the obnoxious 99% disk use indicator. Your hard drive should be defragmented, your storage space should be cleared out of unnecessary files and programs, a disk check should be performed to identify and correct any faults, and your antivirus software should be current. In no time, your computer will be operating like new. No more lagging, freezing, or stressing over possible long-term harm. Give your PC a fresh start by taking action right away. You’ll be glad you did and wonder why you didn’t do it sooner. Enjoy speedier browsing, gaming, and everything else you utilize that piece of metal for on a daily basis by making your computer happy once more. 

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