The computer will warn you when the system C drive gets sull or is out of space. It's a common issue for Windows 10 users. So if you are a Windows 10 user and you need an effective method to extend C drive, try free partition manager - EaseUS Partition Master which can easily increase system partition size and resize/move/merge/split partition in all Windows systems.
When the C drive (system partition) is out of space, the C drive is full, or you get a low disk space warning on Windows 10, and hardware upgrades become unavailable. Here is a real case from Microsoft Community:
How to extend the C drive in Windows 10 could be bothering you for now. EaseUS will introduce how to extend partitions, especially to increase the volume of the C drive in Windows 10 successfully.
For users who want to extend the C drive with a professional and easy method, EaseUS Partition Master Professional is the right choice. As magic partition software, EaseUS Partition Master is a comprehensive hard disk partition management software that you can't miss. Also, this software works perfectly with hardware, even with RAID, and supports all Windows Operating Systems.
Your data is completely protected during all operations. Let's see how to extend the volume of C drive in Windows 10 here:
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.
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.
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.
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".
Do you see? This tool can help extend system partition in Windows 10 efficiently. Share this article to let more users know about this tool.
Option 1. Extend System C drive with unallocated space
Option 2. Extend System C drive without unallocated space
0:00-0:26 Extend System Drive with Unallocated Space; 0:27-0:58 Extend System Drive without Unallocated Space.
Experiencing unexpected issues? Our dedicated troubleshooting team can help you navigate any obstacles you encounter.
EaseUS System Volume or Disk Partitioning Services
Click here to contact EaseUS Partition Master experts for freeEaseUS experts are available to provide you with 1-on-1 manual services (24*7) and help extend C drive or disk partitioning issues. Our experts will offer you FREE evaluation services and efficiently diagnose and resolve low disk space in C drive or other partition problems using their decades of experiences.
Bonus Tip: Extend C Drive with Another Hard Drive/SSD
If you only have 1 system C drive on the disk, and it's full now, but you get a second drive with huge free space, relax. You can apply EaseUS Partition Master with its Extend with 2nd Disk feature for help. You may follow this guide for help:
How do you extend C Drive with another disk?
How to expand the C drive from another HDD or SSD? Follow the full guide below, and you'll successfully get rid of the SSD C drive full issue with ease.
Aside from assisting you in extending system partition, this software lets you enjoy all the powerful functions, such as:
There must be unallocated space behind the partition you want to expand with Window's built-in Disk Management utility. Otherwise, you might find that the Extend Volume is greyed out and unavailable.
Asum that you have contiguous unallocated space next to the C drive, here is how to extend the C drive in Windows 10 using Disk Management:
Step 1. Press the Windows + R keys simultaneously to open the Run dialog.
Step 2. Type diskmgmt.msc and hit Enter to open the Disk Management utility.
You can also right-click This PC and choose "Manage -> Storage -> Disk Management".
Step 3. Right-click on the C drive and choose "Extend Volume".
Step 4. Set and add more size to the C drive and click "Next" to continue.
Step 5. Click "Finish" to complete the process.
Note that if the unallocated space is not behind the C drive, you can revert to Method 1 and apply EaseUS Partition Master for help.
🚩Read Also: How to Fix Cannot Extend Volume
There is another tool named Diskpart, which also enables you to manage your local disk and partition. The Windows Command Prompt utility works the same as the Disk Management tool. One important point is that inexperienced users should not rush to this method because a tiny mistake can damage the entire hard drive. To do so, you'll also need to create unallocated space next to the C drive, then follow these steps below to extend the volume of the C drive using CMD:
Step 1. Press the Windows + X keys and choose "Command Prompt (Admin)".
Step 2. Type the following commands, and each one ends with the "Enter" key:
diskpart
list volume
select volume x (x is the C drive number)
extend size =number (the number is the MB size for extending the C drive)
If there is no unallocated space, you can't extend the C drive in Windows 11/10 with this method. Follow and learn how to fix this issue:
Can't Extend C Drive in Windows 11? Here Is Why and How-to Fix
When you can't extend C drive in Windows 11 or older systems, relax and follow the fixes on this page for help.
Clone and replacing the old drive with a bigger one can also solve your problem. To do so, you have two options:
If you don't want to migrate other data on the C drive, you can only migrate the Windows operating system to a new drive with the help of EaseUS Partition Master.
Video Tutorial: How to Migrate OS from HDD to SSD
If you want to replace the whole C drive, both the system and the data, clone this drive with the help of EaseUS Partition Master. This feature lets you move your system and data to SSD/HDD easily and quickly. Follow the steps below to clone your drive:
Step 1. Select the source disk.
Step 2. Select the target disk.
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.
Also Read: How to Partition A Hard Drive in Windows 11/10
In addition to these solutions, you may ask about a way to extend the volume of the C drive in Windows 10 with or without software. Here, you can learn other tips to reduce the possibility of a full C drive and resize the C drive.
In this article, we discussed how to extend the C drive in three reliable ways. After that, we also provided a bonus tip and practical tips to help users increase the volume of the C drive in Windows 10. If you want to resize your system partition, download EaseUS Partition Master and follow the mentioned methods.
In addition to extending the C drive, some people have asked related questions. Here are some examples:
1. Can we extend the C drive?
Yes, you can. You can use the third-party software, Disk Managemen or Diskpart to expand your C drive in Windows 11/10 easily. Among them, EaseUS partition software is my recommendation. It can extend any drive easily and quickly.
2. Can I extend C drive from D?
Yes, sure. You can extend the C drive from the D drive using unused free space. Here is how to do so:
3. Why extend the volume grayed out windows 11/10/8.1/7?
When you are using Disk Management to increase C drive space, you can right-click "Computer" and choose "Manage" to go, then you can enter "Disk Management." If you see the Extend Volume option grayed out on your computer, there is no unallocated space on your hard disk.
4. How do you add space to the C drive?
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