How to Fix Low Disk Space on Windows 11/10

Can You Permanently Fix the Low Disk Space Warning?

Yes, you can permanently cure the low disk space warning. When you encounter the low disk space Windows 10 or Windows 11 error, it means your system partition has hit critical capacity. While most generic guides tell you to "empty the recycle bin," deleting temporary files is only a temporary band-aid.

If your C drive is fundamentally too small for modern software, the error will inevitably return next week. To stop the low disk space error from popping up, you must fix your hard drive's underlying geometry. You can do this permanently by using professional Windows computer management software like AOMEI Partition Software to directly inject space from another drive into your C drive, or seamlessly move heavy programs to an empty partition without breaking them.

Below is a quick navigation menu to the solutions provided in this guide, comparing permanent cures against temporary native fixes.

Permanent Cures vs. Temporary Quick Fixes

How to Permanently Fix Low Disk Space via AOMEI Partition Software

If you are tired of running Disk Cleanup every week just to keep your PC alive, you need to change your disk layout. AOMEI provides a visual, secure environment to do this without data loss.

AOMEI Partition Software is the industry-standard tool for resolving storage crises. Instead of forcing you to delete your precious files, it allows you to reshape your hard drive dynamically. If you have plenty of space on your D: drive, but your C: drive is suffocating, AOMEI can bridge the gap effortlessly.

Here are the two most powerful methods to permanently banish the low disk space warning.

Method 1: Resize/Move Partition

This method is perfect if you have unallocated space somewhere on your disk, but it is not adjacent to the drive you want to extend. AOMEI can "move" the blocking partitions out of the way.

Step 1. Install and Launch: Download, install, and open AOMEI Partition Software. You will immediately see a clear, color-coded visual map of your disks and partitions.

Step 2. Select the Partition to Resize: Right-click the partition you wish to expand or shrink (e.g., your C: drive) and select "Resize/Move Partition".

Step 3. Drag the Slider: A new window will pop up showing the partition as a graphical bar.

• To Shrink: Drag the border of the partition inwards (left or right) to free up space.
• To Extend: If you have unallocated space anywhere near it, drag the border outward into that space.

✨ Note on Moving: If the unallocated space is separated from your target drive by another partition (like a Recovery Drive), you can right-click that blocking partition, select "Resize/Move," and drag the whole partition to the right, sliding the unallocated space to the left!

Step 4. Confirm the Action: Click "OK" to return to the main menu.

Step 5. Apply the Changes: Notice that your changes haven't happened yet—they are "Pending Operations." Click "Apply" in the top-left toolbar, then click "Proceed".

System Note: If you are resizing the C: drive where Windows is currently running, AOMEI will safely reboot your PC into "Pre-OS mode" to execute the changes without interrupting active system files.

Method 2: Allocate Free Space from D to C Drive

⏱️ Time Required: 2 Minutes | 🔧 Difficulty: Beginner

This is the ultimate magic bullet. If you want to know how to allocate free space from D to C without formatting or deleting any partitions, upgrade to the professional edition, the 1-click feature handles the complex sector math in the background.

Step 1. Install and Launch: Download, install, and open AOMEI Partition Software. You will immediately see a visual map of your disk layout.

Step 2. Select the Empty Drive: Right-click the partition that has abundant free space (e.g., your D: data drive) and select "Allocate Free Space".

Step 3. Set the Transfer Amount: A pop-up window will appear. Type in the exact amount of space you wish to transfer to your system drive (for example, 50.00 GB).

Step 4. Select Target Drive: In the dropdown menu labeled "From [D] to:", select your C: drive.

Step 5. Execute the Transfer: Click "OK". Then, navigate to the top-left toolbar and click "Apply" followed by "Proceed". AOMEI will safely shrink D, move the space, and extend C in one continuous operation. Your low disk space error is permanently gone.

Method 3: Use App Mover to Relocate Heavy Programs

⏱️ Time Required: 5 Minutes | 🔧 Difficulty: Beginner

Sometimes, your C drive is small (e.g., 250GB), and you simply cannot allocate more space to it. However, modern games and Adobe software can easily take up 100GB+. You can move installed programs to another drive in Windows 11/10 safely without breaking them.

Step 1. Open the App Mover: On the main AOMEI interface, click on the "Free Up" tab at the top and select "App Mover".

Step 2. In the new window, click “App Mover”. If you want to move folders, you can choose "Move Folders".

Step 3. Choose the Source Drive: Select your crowded C: drive and click Next.

Step 4. Select the Heavy Software: A list of installed applications will populate, sorted by size. Check the boxes next to your heaviest games or programs. Choose the Destination: In the bottom dropdown menu, select your spacious secondary drive (e.g., your E: or D: drive).

Step 5. Move the Apps: Click "Move" and confirm the prompt. AOMEI will safely transfer the massive files to the new drive and automatically rewrite the Windows registry paths. Your software will still boot instantly from your desktop shortcuts.

4 Manual Fixes to Free Up Disk Space (Windows Native Tools)

If you cannot restructure your partitions right now, you can use these built-in Windows tools to scrape together a few gigabytes of temporary relief.

Fix 1: Run Windows Storage Sense / Disk Cleanup

Windows has built-in utilities to clean up temporary Internet files and leftover update logs.

Step 1. Windows 11/10: Press Win + I to open Settings. Navigate to System > Storage.

Step 2. Click on Temporary Files. Windows will scan your drive for junk data.

Step 3. Check the boxes for Windows Update Cleanup, Thumbnails, and Temporary Internet Files.

Step 4. Click "Remove files". This can occasionally free up 2GB to 5GB of space.

Fix 2: Delete Old System Restore Points (The "No Files" Fix)

If you are suffering from the C drive full but no files phenomenon, Windows is likely hoarding massive amounts of hidden data in "Shadow Storage" to create System Restore points.

Step 1. Press Win + S, type Create a restore point, and press Enter.

Step 2. In the System Properties window, select your C: drive and click Configure.

Step 3. Under the "Disk Space Usage" slider, you might see that Windows is hoarding 20GB+ of data.

Step 4. Click the "Delete" button next to "Delete all restore points for this drive."

Step 5. Slide the Max Usage bar down to a reasonable 3% to 5%, click Apply, and then OK.

Fix 3: Clear Windows Update Cache

Sometimes, Windows downloads massive OS updates but fails to delete the installation files once the update is finished, triggering the low disk space warning Windows 11.

Step 1. Press Win + R, type services.msc, and hit Enter.

Step 2. Scroll down to Windows Update, right-click it, and select Stop.

Step 4. Open File Explorer and navigate to: C:\Windows\SoftwareDistribution\Download.

Step 5. Select every file and folder inside this directory and delete them permanently (Shift + Delete).

Step 6. Go back to the Services window, right-click Windows Update, and select Start.

Fix 4: Empty the Recycle Bin & Temp Folders

It sounds obvious, but forgotten files are the leading cause of sudden storage drops.

Step 1. Right-click the Recycle Bin on your desktop and select Empty Recycle Bin.

Step 2. Press Win + R, type %temp%, and press Enter.

Step 3. Press Ctrl + A to select all hidden temporary app files, and press the Delete key. (If Windows says some files are in use, simply click "Skip").

Tips: Hidden Danger of Low Disk Space on Modern SSDs

Ignoring the low disk space warning doesn't just prevent you from downloading files; in 2026, it actively damages your computer's hardware.

Many users view the low disk space notification as a minor annoyance. However, almost all modern Windows 11 and Windows 10 computers run on NVMe Solid State Drives (SSDs). SSDs operate fundamentally differently from old mechanical hard drives.

To maintain their blazing-fast read and write speeds, modern SSDs rely on an "SLC Cache"—a portion of empty storage used to juggle data rapidly. When you experience SSD performance with low disk space (typically when the drive hits 90% to 95% capacity), the drive loses its ability to cache data effectively.

The Result: Your computer will experience severe stuttering, Windows updates will fail to install, your PC will take significantly longer to boot, and the physical lifespan (Terabytes Written) of the SSD flash memory cells will degrade much faster due to "write amplification."

Ending Summary

The low disk space warning is a critical alert that should never be ignored, especially on modern NVMe SSDs, where full capacity leads to severe performance throttling and hardware degradation.

While native Windows tools like Disk Cleanup and Storage Sense are great for routine maintenance, they are only temporary band-aids. 

To achieve a permanent cure, you must reorganize your disk geometry. AOMEI Partition Software is the ultimate, fail-safe solution. Whether you use the App Mover to effortlessly transplant 100GB games to a secondary drive without redownloading, or utilize the 1-click Allocate Free Space feature to instantly expand your C drive using empty space from your D drive, AOMEI ensures your PC remains fast, healthy, and warning-free in 2026.

FAQ: Low disk space warning

Q1: Why does my PC say "Low disk space but I have space"?

A: This "false positive" is incredibly common. It usually happens for three reasons: 1) Hidden System Restore points are secretly consuming dozens of gigabytes in the background. 2) Your Windows Pagefile (Virtual Memory) has ballooned in size. 3) A corrupted temporary file is causing Windows File Explorer to miscalculate your actual capacity. Running a deep Disk Cleanup or clearing the SoftwareDistribution folder usually fixes the miscalculation.

Q2: Will low disk space slow down my computer?

A: Yes, significantly. Modern operating systems like Windows 10 and 11 rely on your C drive for "Virtual Memory" (swapping data when your RAM is full). Furthermore, SSDs require empty space (SLC Cache) to write data quickly. If your drive is 95% full, your PC will freeze, programs will crash, and boot times will triple.

Q3: Can I fix low disk space by compressing my C drive?

A: While Windows offers a "Compress this drive to save disk space" option in the C drive properties, it is highly discouraged in 2026. Compressing the drive forces your CPU to decompress every single file the moment you try to open it. This will drastically slow down your system's overall performance. It is much better to allocate free space via AOMEI Partition Software instead.

Q4: Is it safe to move installed programs to another drive in Windows 11?

A: It is completely safe if you use professional software like AOMEI Partition Software's App Mover. If you manually cut and paste a program folder from C to D using Windows File Explorer, the software will break because the Windows Registry will still be looking for the files on the C drive. The App Mover tool safely rewrites those registry paths automatically.

Q5: What is taking up so much space on my C drive?

A: Beyond your personal files, the biggest culprits are usually Windows.old folder (created after a major Windows 11 feature update), the AppData folder (which stores massive caches for programs like Adobe and Google Chrome), and the hiberfil.sys file (used for Windows Hibernation mode, which can equal the exact size of your installed RAM).