3 ways to extend volume in Windows 10

Updated on: May 17, 2019

This article introduces how to extend disk partition with Windows 10 Extend Volume function, diskpart command and partition editor software.

Many people have installed or upgraded to Windows 10, from the feedback of Windows 10 users, there are many wonderful features and improvement. However, the same with previous versions, the common disk space issue still exist: the system C drive runs out of space and becomes full after running Windows 10 for a period of time. Low disk space issue could also occur in the volume for applications and backup.

No matter on system partition or data volume, the fastest way to solve this problem is by extending volume with Unallocated space or free unused space in other volumes. In this article I'll introduce 3 ways to extend volume in Windows 10.

Extend volume with DiskPart cmd

DiskPart is a text-mode command interpreter in Windows 10. This tool enables you to manage objects (disks, partitions, or volumes) by using scripts or direct input at a command prompt.

Only when there is adjacent Unallocated space on the right side, you can extend C drive, otherwise, you cannot extend Windows 10 volume with DiskPart.

Steps to extend Windows 10 partition with DiskPart:

Step 1: Press Windows and R key on keyboard, type cmd and press Enter.

Run cmd

Command prompt window will be opened.

Command prompt

Step 2: Type diskpart and press Enter

Diskpart command

Step 3: Type list volume and you'll see all partitions but NO Unallocated space.

List volume

Step 4: Type select volume 1 to give focus to the system C: drive.

Select volume

Step 5: Type extend to proceed extending.

Extend volume

If you extend C drive again, you'll receive error message 'There is not enough usable free space on specified disk(s) to extend the volume.'

Cannot extend

To better understand about this, I suggest open Disk Management (Press Windows and X on keyboard and select from the list).

Win10 disk management

From Windows 10 Disk Management, you'll see clearly the disk partition layout, and whether there is adjacent Unallocated space.

Extend with Windows 10 Extend Volume function

Better than Diskpart command line, Disk Management is graphical interface, so it is easier to most of computer users. The built-in Extend Volume function can help you enlarge partition on the fly.

However, the same with Diskpart, there must be adjacent Unallocated space on the right side of the partition that you want to expand, otherwise Extend Volume is grayed out.

Steps to enlarge partition with Windows 10 Extend Volume function:

Step 1: Right click volume D and select Extend Volume.

Extend volume

Step 2: Extend Volume Wizard will be opened, simply click Next to continue.

Extend volume wizard

Step 3: Select available disk and space, click Next to continue.

Select space

In a short time, volume D will be extended.

Extending complete

The only option to expand C drive is by deleting the adjacent volume (D:), however, it is not suggested, because:

  1. All applications and services point to volume D stop working.
  2. It cause data loss if you forget to back up or transfer the files.
  3. You cannot get Unallocated space even if deleting D in some situation. (learn why)

Besides the limitations above, only NTFS can be extended, FAT32 and other types of partitions are not supported. The best way to extend partition in Windows 10 is running professional partition software such as NIUBI Partition Editor.

Extend Windows 10 volume with software

NIUBI Partition Editor provides basic partition management to create, delete, format partition, change drive letter, etc. Advanced management to resize/move existing partition without data loss, copy, hide, set active, convert, defrag, check partition and much more. It supports Windows 10, 8, 7, Vista and XP (both 32 and 64 bit). To resize and extend partition on Windows 10, you just need to click, drag and drop on the disk map.

The top reason: NIUBI Partition Editor has unique 1 Second Roll-Back technology to ensure system and data intact. Furthermore, it is 30% to 300% faster than other tools because of its advanced file-moving algorithm.

Steps to extend Windows 10 volume with NIUBI PE:

Download this software, you'll see the main window with disk partition information and available operations.

Main window

Step 1: Right click drive D and select "Resize/Move Volume", drag left border towards right in the pop-up window.

Shrink D

Then part of unused space is converted to Unallocated on the left side of D.

Shrink D rightwards

Step 2: Right click drive C and select "Resize/Move Volume" again, drag right border towards right in the pop-up window.

Extend C drive

Then C drive is extended by merging the Unallocated space.

Extend volume C

This software is designed to work in its virtual mode, remember to click Apply to confirm, otherwise real disk partition won't be changed.

If you have shrank drive D with Windows 10 Disk Management,

To extend drive C:

Right click drive D and select "Resize/Move Volume", drag the middle position rightwards in the pop-up window:

Move drive D

Unallocated space will be moved to behind C drive, then follow Step 2 above.

To extend drive E:

Right click drive E: and select "Resize/Move Volume" again, drag the left border leftwards in the pop-up window.

Extend E

Then Unallocated space will be combined into E drive.

Watch the video how to resize and extend partition on Windows 10:

Video guide

In Summary

Windows built-in Diskpart command and Disk Management tool cannot extend a volume by shrinking other one or even by deleting the adjacent partition in some situations. To extend volume on Windows 10, third party partitioning software is much easier. Among these software, NIUBI Partition Editor has unique 1 Second Rollback, Cancel-at-well and Virtual Mode technologies to protect system and data. Besides resizing and moving partitions, it helps you do many other disk partition management.