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

Jean updated on Sep 15, 2020 to Partition Master | How-to Articles

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:

Method 1: Extend C Drive with Partition Manager Software
Method 2: Free Up C Drive Disk Space (3 ways)
Method 3: Upgrade or Add A Larger Hard Disk
Bonus Tips: Make Full Use of Hard Drive Space

Note that the presented fixes are appliable to fix C drive is 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.

Overview of C Drive Full Issue

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 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 C Drive Full

Check the list here and it will explain what is taking up space in C drive in Windows 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 C Drive Is 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

3 Solutions for "C Drive Is full" in Windows 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.

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 Free Partition Manager Software

When 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 Free can extend C drive as you wish without losing data.

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

Download Now

 Windows 10 is supported

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

Step 1: Launch EaseUS Partition Master

Run EaseUS Partition Master

Step 2: Add space to the System C drive

1. Shrink partition and leave unallocated space for extending C: drive:

  • Right-click on a partition next to the C: drive and select "Resize/Move".
  • Drag the end of the partition that is next to the C: drive and shrink it, leaving unallocated space next to the system C: drive, and click "OK".

2. Right-click on the System C: drive and select "Resize/Move".

Extend System partition

To add space to the C: drive, drag the system partition end into the unallocated space.

Add space to C drive

Step 3: Confirm to extend system C drive

Click the "Execute Operation" button, it will list the pending operations, and click "Apply" to execute the changes and extend the C drive.

Confirm to extend system C drive

Method 2. Free Up C Drive Disk Space 

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. 

Here are 3 ways that you can apply to free up space in the C drive and eve the hard disk space:

# 1. 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 and other drives by using the Large File Cleanup feature in EaseUS Tool M:

Step 1. DOWNLOAD EaseUS Tools M for free and install it on your computer.

Step 2. Launch EaseUS Tools M in Windows PC. Select "Large File Cleanup" on the main screen.

large file cleanup - 1

Step 3. Select the drive and click "Scan" to let the program locate, find all large files on your disk.

large file cleanup - 2

Step 4. Identify and select useless large files and click "Delete" to remove those files from your PC or laptop. A message pops up and tells you this process will permanently delete the files. Click "Yes" to start the process.

large file cleanup - 3

# 2. 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

# 3. Delete Temporary Files on C Drive

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:

In Windows 10/8:

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

Step 2: Under "Storage",  select the C: drive to analyze.

Locate C drive to find temporary file.

Step 3: Click on "Temporary files".

Windows 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.

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 unimportant files that you want to delete and click "OK".

Remove temporary files and useless files on Windows 7.

#4. Empty Recycle Bin Regularly

Another extra method that you can try is to empty the Recycle Bin timely. As you know the recycle bin is a location for Windows to save the deleted files for a period (30 days or even longer). 

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.

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

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.

Open EaseUS Partition Master. Right-click the disk that you want to copy or clone. Then, select "Clone".

select the disk that you want to copy

Step 2: Select the target disk.

Choose the wanted HDD/SSD as your destination and click "Next" to continue.

choose a suitable destination

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.)

confirm to continue the cloning process

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.)

Adjust disk layout

Step 4: Execute the operation.

Click the "Execute the operation" option and click "Apply" 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.

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.

Bonus Tips: Make Full 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.

Download Now

 Windows 10 is supported

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Frequently Asked Questions

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Will the "Migrate OS" feature transfer the Windows system files only or the whole C drive?

To ensure that the migrated system will boot normally, the Migrate OS feature will transfer all the files in the system and the boot partitions. Generally, the boot partition is the C drive so the transfer will include all the files in C.

Does EaseUS Partition Master license apply to multiple computers?

The license of Partition Master Professional and Server editions can be used on 1 computer only, while that for for the Technician and Unlimited editions can be used on multiple machines.

What is the difference between EaseUS Partition Master Trial version and the Free version?

Free is for home users only, with most basic functions available such as partition resize and clone. While trial can help you understand how this product works and test what a full license can do on a business or server OS machine.

Will it cause any data loss after resizing the partition in EaseUS Partition Master?

Generally, it will not cause any data loss or boot issue by resizing a partition. However, in order to protect your data, we suggest that you backup the partition before resizing, in case of any unexpected situations such as power outages, computer hardware failures, etc. You can use EaseUS Todo Backup to backup the partition and its trial version is fully functioned for 30 days.

What should I prepare before resizing the partition?

On the partition that is going to be operated, there might be some files being occupied by other programs. To ensure a successful operation, we suggest that you close all the unnecessary software before resizing that partition. Otherwise, EaseUS Partition Master will detect the partition being locked by the other software and require a reboot to resize the partition under boot mode.

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Video Tutorial

How to Partititon a Hard Drive on Windows 10/8/7