How to Increase C Drive Partition on Windows 10/11 Safely

The C drive is typically the place where the operating system, system files, and default programs are stored. As the primary drive or partition, it enables your computer to boot and function properly.

Therefore, you should ensure that the C drive always has abundant space.

If your C drive is almost full, you may notice:

• Low disk space warning
• Slow system startup
• Windows updates failing
• Programs freezing or crashing
• Red storage bar in File Explorer
• Insufficient storage errors

Fortunately, you can increase C drive partition without reinstalling Windows by using Disk Management, DiskPart, or MiniTool Partition Wizard.

Now, depending on your situation (basic or dynamic disks), apply the appropriate methods to expand C drive.

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To extend C drive on the basic disk, here are three tools:

Method 1. Increase C Drive Partition via Disk Management

Disk Management is a built-in Windows utility. To extend the C drive with it, your disk layout should be as follows:

C drive | Unallocated space

Otherwise, the extend operation will fail.

Once the disk layout meets the requirements, follow the steps below to extend the C drive.

Step 1: Right-click the Start icon and then hit Disk Management on the prompted menu.

Step 2: Right-click the C drive and select Extend Volume.

Step 3: Hit Next to move on.

Step 4: Select the amount of disk space to add by typing the specific number. Then click the Next button.

Step 5: Tap on the Finish button to save changes and execute the operation.

Method 2. Increase C Drive Partition via DiskPart

DiskPart is a Windows command-line utility that enables you to run various disk-related tasks by executing corresponding commands.

However, just like Disk Management, this tool requires the same disk layout: C drive | Unallocated space.

Here, I will show you how to extend C drive via DiskPart.

Step 1: Open the Run window by holding the Windows and R keys.

Step 2: Type diskpart in the Run window and press the Ctrl + Shift + Enter keys.

Step 3: In the UAC (User Account Control) window, click Yes to continue.

Step 4: In the DiskPart window, type the following commands in order and hit Enter after each.

• list disk
• select disk 0 (Replace 0 with the number of the disk that contains the C drive)
• list partition
• select partition 3 (Replace 3 with the partition number of the C drive)
• extend (This will take all the unallocated space adjacent to the C drive. To take the desired amount of free space, type extend size=x; x refers to the size in MB used to extend to the C drive.)
• exit

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Method 3. Increase C Drive Partition via MiniTool Partition Wizard

MiniTool Partition Wizard, a free partition manager, offers 2 features to help you easily increase the C drive partition.

• Move/Resize Partition: Extend the C drive with unallocated space that is located adjacent to the right or left of the C drive. The disk layout should be: C drive | Unallocated space or Unallocated space | C drive.
• Extend Partition: Extend the C drive with free space in an existing partition or unallocated space located on the same disk. It is suitable for all disk layouts. You can use it to extend C drive with D drive, E drive, unallocated space, etc.

Here are the steps to use the Extend Partition feature:

MiniTool Partition Wizard FreeClick to Download100%Clean & Safe

Step 1: Launch MiniTool Partition Wizard to enter its main interface.

Step 2: Right-click the C drive and hit the Extend option.

Step 3: Take free space and click OK to save changes.

1. Open the Take Free Space from drop-down menu and select a partition or unallocated space.
2. Move the blue slider to decide the amount of space to take.
3. Hit the OK button.

Step 4: Tap on Apply > Yes to execute the operation. Once done, the result will be displayed as follows.

How to enlarge a partition via the Move/Resize feature? Here’s the online tutorial. You can refer to it to increase C drive partition.

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Increase C Drive Partition on a Dynamic Disk

How to extend C drive in Windows 10 if it is located on a dynamic disk? Disk Management and MiniTool Partition Wizard can help you.

Option 1: Use Disk Management

To extend C drive on a dynamic disk with Disk Management, the disk layout should also meet this: C drive | Unallocated space.

In addition, the C drive should be a simple or spanned volume.

Here are the extending steps:

Step 1: Open Disk Management on your computer.

Step 2: Right-click the C drive and tap Extend Volume.

Step 3: Hit Next in the prompted window.

Step 4: Choose the amount of space to extend and click OK.

Step 5: Click the Finish button to carry out the operation. Then you can view the result.

Option 2. Use MiniTool Partition Wizard

MiniTool Partition Wizard’s Move/Resize feature can expand simple, spanned, mirrored, and striped volumes. To extend C drive on a dynamic disk, follow the steps below:

MiniTool Partition Wizard DemoClick to Download100%Clean & Safe

Step 1: Run MiniTool Partition Wizard.

Step 2: Right-click the C drive and hit Move/Resize Volume. Alternatively, highlight the C drive and click Move/Resize Volume under the Dynamic Disk Management section in the left pane.

Step 3: In the prompted window, drag the arrow icon right forward to occupy the unallocated space. You can also type the desired volume size in the corresponding field. After that, click OK to save changes.

Step 4: Click on Apply > OK to execute the operation.

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Further reading: How to prevent C drive from filling up again? Here are some key preventative actions:

• Enable Storage Sense
• Manage System Restore Points
• Move user folders/downloads
• Change default install location
• Run Disk Cleanup

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Can’t Extend C Drive – How to Fix

As mentioned earlier, you sometimes fail to extend C drive. This can be caused by limitations of the tool you are using, or by the absence or incorrect location of unallocated space. According to the specific cause, take corresponding measures to resolve the problem.

• The unallocated space is not adjacent to the C drive: Windows built-in tools like DiskPart and Disk Management require adjacent unallocated space behind the C drive. In this case, you can utilize MiniTool Partition Wizard to extend the C drive or move the unallocated space to the desired location and extend it again.
• There’s no unallocated space on the disk: If so, you can’t increase C drive partition with Disk Management. To resolve the issue, you can either delete or shrink another partition to create unallocated space adjacent to C, or use a third-party partition manager, such as MiniTool Partition Wizard, to redistribute free space from other partitions on the same disk without manually creating unallocated space..

How to extend C drive in Windows 10/11? This post offers you available methods to increase C drive partition on basic and dynamic disks respectively. Additionally, it tells you what to do if you can’t extend C drive.Click to Tweet

Increase C Drive Partition FAQ

Bottom Line

This post offers 3 tools to increase C drive partition. Among them, MiniTool Partition Wizard is the best one that offers the Extend Partition and Move/Resize features to do that. Just have a try.

If you have any problems or suggestions about MiniTool Partition Wizard, contact us by sending an email via [email protected]. We will get back to you as soon as possible.