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3+ Solutions: Solve C Drive Full and Out of Space in Windows 11/10/8/7

Why is my C drive full, how to fix it? Here are 3 solutions for you to apply and resolve C drive full issue in Windows 11/10/8/7. Try provided solutions to fix this issue when your computer prompts a low disk space warning because the C drive is full and out of disk space.

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Updated by Tracy King on Nov 21, 2023
Written by Jean

Is your Windows computer warning that "You are running out of space on Local Disk (C:)..."? If it's so, it means that your C drive is full. So what causes or why is C drive full? What is taking up space on C drive? And how can you free up space on the C drive? 

Windows 10 C drive full

Follow the content guide here get the most effective fixes for the C drive full issue and make your computer running fast again:

Note that the presented fixes are appliable to fix C drive is a full issue on all Windows OS, even if you are using old Windows 8.1/8/7 or older versions. All problems will be addressed properly with solutions on this page. Alongside these methods, you can fully trust EaseUS Partition Master Professional, as shown in Method 1, to extend C drive on all Windows computers seamlessly.

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Newer Windows 11 users could follow this page to get help: Extend C Drive in Windows 11

Overview of C Drive Full Issue

What is C Drive? It is the default volume containing system and data. In this part, you'll learn everything about "local disk C is full", including:

  1. 1. What is C drive full error
  2. 2. Why is C drive full or what is taking up space on C drive
  3. 3. What happens if C drive gets full

What Is C Drive Full Error

Generally, C drive full is an error message that when the C: drive is running out of space, Windows will prompt this error message on your computer: "Low Disk Space. You are running out of disk space on Local Disk (C:). Click here to see if you can free space o this drive."

Different Windows OS will show different symptoms when the C drive is full.

  • If C drive gets full in Windows 11/10 or Windows 7, the C drive will be shown in red as below:

Windows 7 c drive is out of space

  • If C drive gets full in Windows XP, it will display a similar Low Disk Space warning message as shown here:

Windows XP c drive is out of space

Why Is My C Drive Full

Check the list here and it will explain what is taking up space in C drive in Windows 11/10/8/7 and make your system partition merely full:

  1. #1. Windows OS, system-related files and settings
  2. #2. Installed applications, Windows built-in programs, and the downloaded software
  3. #3. User data, like Documents, Photos, etc., and personal data saved on Desktop or in C drive

If Local Disk C Drive Full, What Will Happen

If your computer reports that the C drive is out of space, you're likely encountering one or more of the situations listed below:

  • Windows OS slows down or becomes extremely slow
  • Low storage space for storing more data and files
  • Not big enough to install Windows update
  • Unavailable for program installation

Next, we will provide 3 solutions for C drive is full, if you want to shrink C drive, you can click the link:

related articles

How to Shrink C Drive without Losing Data [2023 Full Guide]

How to shrink C drive on Windows 10? You are in the right place if you are looking for a detailed answer about shrinking C drive. On this page, you can get three free tools to successfully shrink C drive without destroying data.

shrink c drive

3 Solutions for "C Drive Is Full" in Windows 11/10/8/7/XP

If you are facing the C drive full or low disk space issue, don't worry. Pick up one of the presented solutions here, you'll be able to effectively extend C drive and speed up PC:

  1. #1. Extend C Drive Which Is Full
  2. #2. Free Up C Drive Space
  3. #3. Upgrade System Disk or Add Another Disk
To avoid unnecessary data loss issue, we'd like to suggest you back up important data in advance.
EaseUS Todo Backup Free can help you effectively back up valuable files, disk partition, and even the OS in 3 simple steps.

Method 1. Extend C Drive with Partition Manager Software

When the C drive is out of space on your PC, an efficient way is to extend C drive with professional partition manager software. EaseUS Partition Master can extend C drive as you wish without losing data.

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Now, follow the steps below to extend your C drive so to fix low disk issue with simple clicks:

Step 1. Click "Adjust with 1-Click" to extend C drive.

When your C drive is out of space, hover your mouse over the C drive, you will see the Low Disk Space alert on EaseUS Partition Master. Click "Adjust with 1-Click" to extend it.

How to Adjust Low C Drive Space Step 1

Step 2. Click "OK" to extend C drive automatically.

By clicking "OK", EaseUS Partition Master will automatically allocate space to your C drive to solve the low space issue.

How to Adjust Low C Drive Space Step 2

Extra Option: You can also click "Manual Adjustment" to extend the C drive manually.

When turning to Manual Adjustment, select the C drive, and drag dots rightward to add more space to C drive. Click "OK" to confirm.

Manually Adjust Low C Drive Space

Step 3. Confirm to resolve low disk space in C drive

Click the "Execute Task" button at the top corner and start all pending operations by clicking "Apply".

How to Adjust Low C Drive Space Step 3

Video Tutorial to Extend System C Drive With or Without Unallocated Space via EaseUS Partition Master:

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Enlarging the system drive is only one of its powerful features. EaseUS Partition Master also enables you to manage your disks or partitions safely and effectively with more powerful features, such as merging partitions and converting MBR to GPT. Don't hesitate to give it a try.

Method 2. How to Free Space In C Drive

Mostly, useless large junk files, big files, huge installed programs, and temporary files are taking up the most space in your system C drive after using your PC for a long time. So the other effective method you can try is to free up hard disk space. And you can also free up disk space on Windows 8.

Here are 5 ways that you can apply to free up space in the C drive and even the hard disk space:

#1. Disk Cleanup
#2. Delete Temporary Files
#3. Empty Recycle Bin
#4. Clear Useless Large Files
#5. Transfer Large Files and Programs to Another Drive

If you find these methods of freeing up disk space effective, you can share them with more people in need.


#1. How to Free Up Space in Local Disk C by Disk Cleanup

Disk Cleanup is a Windows built-in tool that you can apply to delete some files so as to free up disk space via Windows File Explorer. Follow the steps below to free up disk space on your C drive:

Step 1. Press Windows + R to bring up Windows File Explorer.

Step 2. Click "This PC", right-click on C: drive and select "Properties".

Step 3. In Disk Cleanup, select the files you want to delete and click "OK".

If Windows installation files (Windows.old folder) show up, check and delete them. This will help to free up a huge space in C: drive.

Run Disk Cleanup to free up space in C drive

#2.  How to Free Up Space in C Drive with Delete Temporary Files 

As you know that temporary files generated by Windows OS may also take up huge space on the system C: drive. You can also try to delete the temporary files so as to resolve the C drive full issue. Some steps to delete the Temp files on different Windows OS may differ:

Delete Temporary Files in Windows 11/10/8:

Step 1: Press "Windows + I" to open Windows Settings, click on "System" and " Storage".

Step 2: Under "Storage", select "This PC (C:)" to analyze.

Locate C drive to find temporary file.

Step 3: Click on "Temporary files".

Windows 11/10/8 will list "Temporary files", "Downloads folder", "Recycle bin", and more in this section.

Locate temporary files on C drive.

Step 4: Check the box of content you want to remove and click on the Remove files button.

Remove temporary files from C drive.

Step 5: Go back to Storage usage and now click "Other".

Select its content, right-click unwanted files that are taking most storage space and select "Delete" to remove the files and folders.

Delete Temporary Files in Windows 7:

Step 1: Open My Computer, right-click the C drive, and select "Properties".

Step 2: Click the "Disk Cleanup" button in the disk properties window.

Step 3: Select temporary files, log files, Recycle Bin, and other useless files that you want to delete and click "OK".

Remove temporary files and useless files on Windows 7.

#3. Empty Recycle Bin Regularly to Clear Space in C Drive

Another method that you can try is to empty the Recycle Bin timely.  Windows to save the deleted files in the Recycle Bin for a period (30 days or even longer by default). 

If you never cleared the recycle bin, it will take up a certain space on your system C drive, which as a result, your C drive is getting full.

So we suggest you empty the recycle bin regularly. Note that before you start, check the recycle bin and make sure you have restored some important deleted files back to its original location. Everything left in the Recycle Bin is not essential.

To empty the recycle bin, you have two ways to go:

1. Select to Empty Recycle Bin from Temporary Files

You may revert to the forward method as a guide so as to empty Recycle Bin files from Temporary Files.

2. Manually Empty the Recycle Bin

Step 1. Open Recycle Bin from the desktop.

Step 2. Select all recycled files in the Recycle Bin, right-click them, and select "delete".

empty recycle bin to free up disk space on C drive

If you lost vital files after emptying Recycle Bin, refer to: Recycle Bin Recovery for help.

#4. How to Make Space in C Drive by Clear Useless Large Files 

A huge number of useless large files will be generated in the C drive while using applications, software, and Windows system. You can effectively scan and delete the large files on the system C: drive.

Step 1. DOWNLOAD and install EaseUS Partition Master for free and launch it on your Windows PC.

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On the suite, hover your mouse on "PC Cleaner", click the Download icon to install and launch EaseUS CleanGenius.

Launch EaseUS Clean Genius

Step 2. On EaseUS CleanGenius, select "Cleanup" on the main screen, and click "Scan" to start scanning.

large file cleanup - 1

Step 3. When the scanning process completes, select useless large files and click "Clean" to clean large files.

large file cleanup - 2

Step 4. When EaseUS CleanGenius completes cleaning the files you choose, click "Done" to finish the process.

large file cleanup - 3

#5. Transfer Big Files and Programs from C to Another Drive

The other way to free up C drive space is to transfer the saved big files and installed big programs to another drive. You can manually copy big files from C drive to other non-system drives on your PC.

To migrate the C drive installed program, you can apply professional PC transfer software like EaseUS Todo PCTrans for help. It's Local App Migration feature will do the job for you:

Read Also: Transfer Programs from C Drive to Other Drive without Reinstallation

Method 3. Upgrade System Disk to A Larger Disk or Add A New One

If you find your C drive is out of space frequently or the methods above cannot thoroughly resolve your issue, you may try to upgrade your system disk to a larger one or add another hard disk to your computer.

#1. Upgrade System Drive to A Larger Hard Drive

If the whole system hard disk is out of space, or the hard drive is too small, you can consider upgrading the current hard disk to a larger one.

"Disk Copy" feature of EaseUS Partition Master has the ability to help you upgrade to a larger disk. You don't need to reinstall the operating system and applications.

Step 1. Select the source disk.

  • Click the "Clone" from the left menu. Select the "Clone OS Disk" or "Clone Data Disk"  and click "Next".
  • Choose the source disk and click "Next".

Step 2. Select the target disk.

  • Choose the wanted HDD/SSD as your destination and click "Next" to continue.
  • Read Warning message and confirm "Yes" button.

Step 3. View the disk layout and edit the target disk partition size. 

Then click "Continue" when the program warns it will wipe out all data on the target disk. (If you have valuable data on the target disk, back up it in advance.)

You can select "Autofit the disk", "Clone as the source" or "Edit disk layout" to customize your disk layout. (Select the last one if you want to leave more space for C drive.)

Step 4. Click "Start" to start the disk cloning process.

IMPORTANT: Mostly, the system C drive space is suggested to be 120GB or even bigger for excellent computer performance. So after replacing the old system disk, it's recommended that you add or allocate more free space to the system C drive by following Method 1.

#2. Add Another New Hard Disk

If you have a decent-sized hard drive that is running out of space, adding a new hard disk will give you additional storage without having to erase the existing hard drive. It could be either an internal or external hard disk.

Also Read: How to Install a New HDD/SSD in Windows.

Later, you can follow the 2nd way in Method 2 to manually copy big files and transfer installed programs to the other hard drive with ease.

Tips: Prevent C Drive Full, Make Use of Hard Drive Space

To prevent your C drive gets full again, here are some tips that you can follow to make full use of hard drive storage space:

  • #1. Allocate or leave 120GB or more space to system C: drive.
  • #2. Install big programs and software to non-system partition, like D: or E:.
  • #3. Save and backup large files to non-system partition or external storage devices.
  • #4. Clear temporary files, junk files regularly.
  • #5. Empty recycle bin timely

The End Line

On this page, we explained that is C drive full error, what takes the most space on C drive, and how to fix C drive full issue with 3 major methods.

Note that, to avoid unnecessary data loss, we always suggest you backup important files from C drive to another device in advance. For the most efficient solution, extending C drive with EaseUS Partition Master is always the best option. It's easy and free.

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FAQs of Local Disk C Drive Full

1. My C drive is full and there's nothing on it I can delete?

If there is nothing you can delete on local disk C, you can allocate space from another drive to the C drive with EaseUS partition manager software.

2. How to create more space on my c drive?

Creating more space on the local disk C drive can be done by EaseUS Partition Master. There is an easy way to extend the c drive space with an intelligent C drive adjustment function. If your hard drive is full and there is no way to free space, another correct answer is to replace the existing drive with a bigger one.

3. What is using up my c drive space?

Go to the Settings, click System and Storage, and check the storage usage of the local disk.

How Can We Help You

About the Author

Updated by Tracy King

Tracy became a member of the EaseUS content team in 2013. Being a technical writer for over 10 years, she is enthusiastic about sharing tips to assist readers in resolving complex issues in disk management, file transfer, PC & Mac performance optimization, etc., like an expert.

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Written by Jean

Jean is recognized as one of the most professional writers in EaseUS. She has kept improving her writing skills over the past 10 years and helped millions of her readers solve their tech problems on PC, Mac, and iOS devices.

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  • I love that the changes you make with EaseUS Partition Master Free aren't immediately applied to the disks. It makes it way easier to play out what will happen after you've made all the changes. I also think the overall look and feel of EaseUS Partition Master Free makes whatever you're doing with your computer's partitions easy.

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  • Partition Master Free can Resize, Move, Merge, Migrate, and Copy disks or partitions; convert to local, change label, defragment, check and explore partition; and much more. A premium upgrade adds free tech support and the ability to resize dynamic volumes.

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  • It won't hot image your drives or align them, but since it's coupled with a partition manager, it allows you do perform many tasks at once, instead of just cloning drives. You can move partitions around, resize them, defragment, and more, along with the other tools you'd expect from a cloning tool.

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