January 27, 2024

Extend C Drive in Windows 10/11

Want to know how to extend C drive with unallocated space because it is full or nearing full capacity? A full drive can cause many issues on Windows 11/10 system and if you wish to extend it, it depends on certain conditions. So, expanding it is not as easy as it sounds. However, don’t get into a panic after listening to this statement. You’ve landed on right page. This guide will teach you how to increase C drive space according to different scenarios. So, let’s begin, shall we?

Part 1: Necessary Conditions to Extend C Drive

You can only extend C drive if you follow certain conditions such as mentioned below:

  • There must be unused space (unallocated space) on hard drive next to C drive. If there’s no unallocated space, shrink or delete other partitions to create one.
  • You can’t extend C drive by diskpart or Disk Management if unallocated space is not adjacent to C drive. In such cases, we highly recommend using third-party tools.
  • If your drive uses an MBR partition, check whether it is close to 2TB limit. If it’s already there, you can’t extend it any further.
  • Mostly Windows use NTFS file system as default. Therefore, for “Extend Volume” option to work your C drive must use this format.
  • If your disk is a basic disk, converting it to a dynamic disk might be necessary in some cases.

Otherwise, you’ll see “Extend Volume” option greyed out. Also, remember to back up data before modifying partitions to avoid problems or data loss.

Part 2: How to Extend C Drive Windows 10/11?

To learn how to extend C drive if unallocated space is next or not adjacent to drive in Windows 10/11, check out methods below:

Situation 1: Extend C Drive When There Isn’t Adjacent Unallocated Space

When there isn’t any unallocated space next to C drive, Windows built-in tools like diskpart and Disk Management can’t extend C drive. This is because they operate within the structure of the physical hard drive, working with blocks of sectors. To expand a partition, these tools can only add blocks directly next to it. Therefore, the only thing you can do is to create an unallocated space and delete all partitions between it and the C drive. If you don’t want to risk data loss due to partition expansion, give 4DDiG Partition Manager a try.

It visually shifts non-adjacent unallocated space to be next to C drive without physically moving data. Moreover, it uses advanced algorithms to move files and adjust partition boundaries, maintaining data integrity and continuity. Take a look below for this tool’s fabulous features:

  • Extend C drive even if there isn’t adjacent unallocated space.
  • Safeguard data while increasing C drive space.
  • Allow users to further manage partitions, such as deleting, creating, and formatting.
  • Convert from MBR to GPT in just a few clicks.

Here’s how to extend C drive with this tool:

Step 1: Open partition management tool on your PC and choose “Partition Management.”. Right-click on partition to extend, choose “Extend/Shrink” from menu and adjust size by dragging the borders right or left.

Step 2: You can also select an adjacent partition or unallocated space, and drag border to release space for target partition.

Step 3: Click “OK” to go back and press “Execute 1 Task(s)” in Task window. Click “OK.”

Step 4: The extension process time varies based on added space so, don’t close until the process completes to avoid data loss. Click “Done” when partition extension is successful.

Situation 2: Extend C Drive When There Is Adjacent Unallocated Space

To extend C drive Windows 10/11, the unallocated space must not only be next to it but also on its right side. You have two options to extend it. Either use Disk Management to extend C drive or if you have technical skills you can also utilize Command Prompt for same purpose. Here’s how to extend C drive with unallocated space when it’s adjacent to C drive:

2.1 Increase C Drive Space by Disk Management

Disk Management is a built-in tool in Windows to manage a computer’s storage. Its main function is to help in partitioning, formatting, and assigning drive letters to each partition. You can also adjust partition sizes, change partition types, and delete unnecessary parts to manage space better. Here’s how to extend C drive to unallocated space with Disk Management:

Step 1: Right-click “Windows Start” menu and then choose option of “Disk Management” to extend C drive.

Step 2: Right-click “C drive.” Next, choose “Extend Volume….”


Step 3: Click “Next” on the Extend Volume Wizard.


Step 4: Enter the amount of space you want to add to the C drive in the “Select the amount of space in MB” field.

Step 5: Click “Next” and press “Finish” to complete process.

2.2 Increase C Drive Space with CMD

Diskpart is another built-in Windows tool to manage your storage devices. It gives you more control over disks, partitions, and volumes compared to Disk Management. You can switch between MBR and GPT partition styles, wipe drives completely, or assign specific IDs to partitions. However, you must be familiar with command line interface to use Diskpart. Here’s how to use Diskpart to extend C drive to unallocated space:

Step 1: Type in “CMD” in “Windows Start” menu, right-click “Command Prompt” and run it with admin privileges.

Step 2: Type in “diskpart” to launch Diskpart Utility for managing disk partitions and press “Enter.”

Step 3: Use “list volume” to see all available volumes (disks) and press “Enter.”

Step 4: Identify your C drive’s volume number and enter “select disk [number].” Replace [number] with your C drive’s volume number) and press “Enter.”

Step 5: Type in “list partition.” Press “Enter.”

Step 6: Enter “select partition [number]. (Replace [number] with your C drive’s volume number) and press “Enter.”

Step 7: To extend the C drive, if there’s unallocated space, type “extend size =[number]” (replace [number] with MB size). Press “Enter.”

Close Command Prompt and check if you are able to extend C drive to unallocated space successfully.

Part 3: Why Do You Need to increase c drive space?

When you extend C drive to unallocated space it offers various benefits, especially if you’re running out of space. Here are key advantages:

  1. More Disk Space – Having a larger C drive space is great because it gives you more space for your programs, files, and temporary data. You can install large programs, save large video projects, or download lots of games without running out of space.
  2. Improved System Performance – When your C drive gets too full, Windows slows down because of fragmented data and not enough room for temporary files. When you extend C drive Windows on 10/11 it helps system run smoother. Programs start faster, handling files becomes quicker, and your computer responds better overall.
  3. Reduced Data Loss Risk – If your C drive is always full, it’s difficult to regularly back up data. This can be risky in case your drive has hardware problems or gets corrupted by malware. With more space, you can easily set up automatic backups without stressing about running out of storage.
  4. Enhanced Data Consolidation – Managing files across multiple drives can be an issue. But when you extend C drive to unallocated space, you can have all your important files and programs in one place and won’t need to use different drives or external storage. This organizes your work better and saves time searching for files.

How to Extend C Drive in Windows 10/11 FAQs

Q1: Why can’t I extend my C drive Windows 10?

You can’t extend C drive if there’s no unallocated space on your hard disk and it isn’t next to C drive. Another reason you can’t extend volume on drive is if it’s formatted to another file system other than NTFS or uses an older MBR partition table.

Q2: Can C Drive Be Increased?

Yes, you can extend C drive Windows 10/11 by using “Extend Volume” option in Disk Management. Or use diskpart if you’re familiar with the command line interface. However, If unallocated space isn’t adjacent to C drive or C drive has a file system other than NTFS, consider a third-party tool like 4DDiG Partition Manager. Other than extending volume, it offers comprehensive partition management features like creating, merging, formatting, shrinking, cloning, and much more.

Q3: Why is my C Storage so full?

Your C storage is full because of too many files and programs accumulating with time. To make more space in your storage, you can delete files you don’t need, move larger files to other storage devices, and organize your storage better.

Final Words

Knowing how to extend C drive with unallocated space is vital when you’re facing low storage. By following three effective solutions outlined in this guide, you can increase C drive space depending on different scenarios.

If there’s an unallocated space next to drive use Disk Management or Diskpart Utility. However, if space is not adjacent to drive, these tools won’t work. So, in such a case, consider using 4DDiG Partition Manager and take control of your computer’s performance by optimizing and extending your C drive without data loss.

About the author 

Kyrie Mattos

{"email":"Email address invalid","url":"Website address invalid","required":"Required field missing"}