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How to Extend C Drive/System Partition in Windows 7/8/10

  > Products > Partition Manager > How to Extend C Drive/System Partition in Windows 7/8/10

2016-10-26 15:25:47 Posted by Daisy to EaseUS Partition Manager

C drive is running out of disk space? Here are reliable solutions shows you how to extend C drive in Windows 7/8/10. Just follow the tutorial step by step whenever you need to increase C drive space or extend system partition.

Low disk space warning forces you to extend C drive/system partition

Windows create the low disk space warning to alert computer users when there is not enough space on the disk. When this warning pops out, it means that you will suffer a big risk of data loss and low work efficiency with the computer. The reason is that if there is no enough space for the system, the computer will not work efficiently and stably. Besides, defragment and more installation are not available.

Low Disk Space

Have you ever met low disk space warning when using your computer? how do you deal with this issue? Usually, there are two solutions. If here are many old or unnecessary files on the system partition, you can delete them to free up some disk space and  fix c drive full or low disk space issue. Otherwise, you may need to extend C drive with special partition tool to speep up Windows system and get better performance. Here, we shows you how to extend c drive in Windows 7/8/10 in several ways. Just try the one works best for you to increase C drive space or extend system partition whenever you need.

Solutions to extend C drive/system partition in Windows 7/8/10

Solution 1. Extend C drive with EaseUS partition tool
Solution 2. Extend C drive with Windows built-in Disk Management
Solution 3. Extend C drive with Windows built-in DiskPart command

Solution 1 - Extend C drive/system partition with EaseUS partition tool

EaseUS partition software is a professional disk management tool with "Resize partition" feature that designed to fix low disk space issue and manage storage space with high efficiency. It can help you extend C drive in Windows 7/8/10 by fully making use of the free space and unallocated space on the same disk or shrinking and moving large partitions. Now, you can free download EaseUS partition software and follow the guide below step by step to extend C drive. 

Tips: Before trying to extend C drive, do remember to backup all important data in computer partitions. Or you might suffer huge data loss problem.

1. Launch EaseUS free partition software, right click the D: partition and choose "Resize/Move partition" to carve up free space for the system partition(C: drive).

Choose Resize and Move partition option to extend C drive

2. Position the mouse pointer on the partition that you need resize to leave more free space for extending system partiiton and drag the handle to adjust its exact size.

Extend C drive

If the unallocated space is not right behind system partition, use the mouse to drag it right next to system drive(C partition). And then put the mouse pinpiont to the right handle of system drive, drag it rightwards to extend system partition(C drive).

Tip: Sometime the unallocated space is on the left of the partition you want to extend, just drag the left partition handle leftwards to the size you want.

3. Click "Apply" to extend C drive.

Tips: Extend NTFS system partition without rebooting the computer, refer to how to extend NTFS system partition without rebooting?

Solution 2 - Extend C drive/system partition with Windows built-in Disk Management

If you are using Windows Vista, Windows Server 2008 or Windows 7/8/10, its built-in disk management tool with  "Extend Volume" feature can help you extend system partition.

 Extend C drive/system partition with Windows built-in Disk Management

Step 1. Go to computer iCon, right-click it and choose Manage.

Setp 2. At the letf side, click Storage and Disk Management.

Step 3. Right click the partition behind system drive and choose Delete Volume.

Now the partition behind system drive becomes unallocated. You need to be sure that the deleted partition does not contain important data. Or you need to move data to otehr partitions firstly.

Step 4. Right-click system drive and choose Extend Volume and click Next

Step 5. Specify the size that you want to add to system partition and click Next. At last, click Finish to extend C drive​.

Solution 3 - Extend C drive/system partition with Windows built-in DiskPart command

Diskpart command applies to the following Operating Systems:

Operating Systems System partition Data partition
Windows Server 2003 - Support
Windows XP - Support
Windows Vista Support Support
Windows Server 2008 Support Support
Windows 7/8 Support Support

The above Operating Systems built-in Diskpart command can extend system partition when there is continuous unallocated space behind the system partition. Take system partition on disk 0 for example.

1. Click Start and type cmd, then press enter. In the command prompt, type diskpart and press enter.

2. Type list disk and press enter.

3. Type select disk 0 and press enter.

4. Type detail disk and press enter. This will give you a list of all the volumes on the selected disk.

5. Type select volume 0 (system partition) and press enter.

6. Type extend.

The above methods (Solution 2 and Solution 3) can only extend system partition when there is unllocated space behind it. Otherwise, you cannot extend it. If there is no unallocated space behind the system partition, how to extend it? Partition manager software - EaseUS partition software can do. It can also be applied to solve other partitioning problems such as to convert fat 32 in Windows XP and Vista.