How to Extend System Partition in Windows 10

Brithny updated on Feb 13, 2020 to Partition Master | How-to Articles

Provided solutions for extending system C drive can also be applied to increase other partitions on your Windows 10/8/7/XP PCs.

Part 1. 3 Methods to Extend System Partition with Adjacent Unallocated Space

Part 2. Extend System Drive without Unallocated Space

Can I extend my C drive partition in Windows 10

When the C drive is out of space, many Windows users would come up with the need to extend the system C drive. Actually, extending system partition on your Windows 10 computer can benefit you.

By extending your system volume or C: partition, you can make full use of free or unallocated space that is not being used by other partitions. And the significant benefit of extending C drive is that your computer will gain better, optimized performance with faster speed. 

If you are having the question of "Can I extend my C drive partition in Windows 10", the answer is yes. Free partition manager software - EaseUS Partition Master Free, with Windows Disk Management and DiskPart, will increase your system volume in 4 ways. Check and follow the easiest way to extend your system partition with ease.

Part 1. Extend System Partition with Adjacent Unallocated Space

When there is unallocated space next to your system C drive, you may apply free partition manager software - EaseUS Partition Master Free, Disk Management or Diskpart to extend Windows 10 system volume. Check and follow the easiest way to get the job done.

Don't worry when the unallocated space is not behind your C drive. You may use the Resize & Move feature in EaseUS Partition Master and right-click partitions one by one between your C drive and the unallocated space so to move the unallocated space next to your system drive.

[Automated] Extend system partition with EaseUS Partition Master

EaseUS Partition Master Free is a FREE comprehensive hard disk partition management software that supports extending system partition on Windows 10/8/7/Vista/XP 32 bit and 64-bit Operating Systems. Your data is completely protected during the whole process. 

Download Now

 Windows 10 is supported

How to extend Windows 10 system partition with EaseUS Partition Master

If your disk has adjacent unallocated space next to C drive, move to the 2 in Step 2 and start increasing C drive.

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

[Manual] Extend Windows 10 system partition with Disk Management

Warning
Using Disk Management to extend Windows 10 system partition, there must be contiguous space behind Windows 10 system partition. Otherwise, you cannot extend system partition.
In this situation, you need third-party partition manager software like EaseUS Partition Master for help.

Let's see how to extend your Windows 10 system partition in Disk Management:

Step 1. Open Disk Management by right-clicking Windows icon and select "Disk Management".

Step 2. Right-click on the system partition that you want to extend, and select "Extend Volume" from the menu.

Extend C drive with unallocated space in Disk Manamgenent.

Step 3. Click "Next" and specify the size of the unallocated space that you want to add to the C drive, click "Next" to continue.

Click "Finish" to complete.

Confirm to extend C drive with Disk Management.

[Manual] Extend C drive on Windows 10 with DiskPart

Apart from Disk Management, another Windows built-in tool DiskPart also provides powerful partition management feature to help you extend the system C drive in Windows 10.

Note that DiskPart only works when the unallocated space is behind the system C drive on your PC.

Here are the detail steps:

Step 1. Right-click on the Windows icon and select "Search", type: cmd and hit Enter.

Step 2. Type: diskpart and hit Enter. Click "Yes" to open DiskPart.

Step 3. Type the following command and hit Enter each time:

  • list volume
  • select volume 1 (Replace 1 with the volume number of your system C drive.)
  • extend

Extend C drive in DiskPart.

or the following command:

  • list disk
  • select disk N (Replace N with the disk number of your system disk.)
  • list partition
  • select partition 2 (Replace 2 with the number of your system partition.)
  • extend size=X disk=N (Replace X with the specific size of the unallocated space and X is MB unit. Replace N with the disk number of your system disk.)

DiskPart extending C drive.

  • Step 4. Type: exit to close the DiskPart window when you finish extending the C drive.

Part 2. Extend Windows 10 System Drive without Unallocated Space

When there is no unallocated space on your system disk, what will you do?

If you tend to use Disk Management or DiskPart, shrink or delete the volume behind your C drive. And follow methods in Part 1 to add space to your C drive.

If you have free and unused space in other partitions on your system disk, you may apply EaseUS Partition Master with its Allocate Space feature to directly extend your system drive.

Note that this feature is currently available in its Pro and advanced versions. Therefore, to extend the system drive and make full use of space on your hard drive without deleting or shrinking partitions, upgrade EaseUS Partition Master to the Pro version first.

You may click the purchase button here to get an upgrade license here:

 

EaseUS Partition Master Pro

Allocate Space and Extend C Drive

 

Upgrade Now

 

After upgrading to the Pro version, continue with the following steps to extend your system drive without unallocated space:

Step 1. Locate the Target Partition

To start extending partition, you should first launch EaseUS Partition Master and locate the target partition which you would like to extend.

Step 2. Extend the Target Partition

1. Right-click on the target partition which you would like to extend and select "Resize/Move".

Select target partition to extend

2. Drag the partition panel rightward or leftward to add unallocated space into your current partition and click "OK" to confirm.

choose another drive to allocate space

3. If there is no or not enough unallocated space on your disk, use the advanced partition resizing function to directly allocate free space from other partitions to the target drive without deleting or formatting.

Find the "Allocate XX space from" option, then click "Select partition". Choose the partition from which you want to allocate space. Drag the partition panel rightward or leftward to resize the partition you want to extend. Then click "OK" to confirm.

choose another drive to allocate space

Step 3. Execute Operations to Extend Partition

Click the "Execute Operation" button and click "Apply" to keep all the changes. 

finish extending partition

Conclusion

This page includes 3 partition management tools - EaseUS Partition Master, Disk Management, and DiskPart, to help you effectively extending C drive on Windows 10, 8 or even older system with or without unallocated space. 

If you have more questions about extending partition, you may check top concerned FAQs below to find direct answers:

1. Can I extend my C drive partition Windows 10?

The answer to "Can I extend my C drive partition in Windows 10"  is yes. EaseUS Partition Master Free, with Windows Disk Management and DiskPart, will increase your system volume in 4 ways. Check detailed steps on this page to extend your system partition with ease.

2. How do I extend my Windows partition?

Open Disk Management and right-click a partition next to your target drive, select Shrink Volume. Then adjust the size you do like to shrink and add to the target partition, click Next and Finish.

Then right-click on the target drive and select Extend Volume. Select to add all the unallocated space, click Next to confirm. Click Next and Finish to complete the process.

3. Why is Extend Volume disabled in Windows 10?

There are three reasons that may cause the Extend Volume option greyed out: 1. There is no unallocated space on your hard drive. 2. The target partition is FAT or other file systems, not NTFS. Only NTFS is a configured file system supported on Windows partitions. 3. There is no contiguous unallocated space next to or behind the target partition.

To resolve this issue, you will need to free up unallocated space and leave it next to your target partition. And convert FAT partition to NTFS.

For more concerned questions, you may use the search option on the right top corner of our website - https://www.easeus.com to search and find solutions. 

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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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