Extend C drive

3 ways to extend volume in Windows 10

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 is running 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 extending volume with Unallocated space or free space in other volumes. In this article I’ll introduce 3 ways to extend volume in Windows 10.

Extend volume win10

Extend volume with Windows built-in DiskPart

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.

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

Note: 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.

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 (right click Windows on bottom left corner and select Disk Management).

Win10 disk management

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

Extend partition with Window 10 Disk Management

Better than Diskpart command line, Disk Management is graphical interface and seems to be easier. However, the same with Diskpart, only when there is adjacent Unallocated space on the right side, you can extend a volume.

Steps to extend Windows 10 volume with Disk Management:

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

Cannot extend volume in Windows 10

As I said above, if there is no adjacent Unallocated space on the right side, you cannot expand a drive, when you right click it, Extend Volume is grayed out.

Extend grayed out

The only option to expand C drive is by deleting 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)

The best way to extend partition in Windows 10 is running professional partition software. There is free partition manager such as NIUBI Partition Editor Free that helps you resize and extend partition easily.

Extend Windows 10 volume with free partition manager

NIUBI Partition Editor Free Edition is completely free for home users, but it is powerful. It 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.

NIUBI Partition Editor is the only software that integrated Roll-Back technology to ensure 100% data safety while resizing partitions. It is also at least 30% faster than other tools because of its unique file-moving algorithm.

Steps to extend Windows 10 volume with NIUBI Partition Editor:

Step 1: Downloadto install, right click D drive and select Resize/Move Volume.

Resize volume

In the pop-up window, drag left border rightwards to shrink D.

Shrink D

Drag to shrink

Click OK and it will back to the main window, where you’ll see that 20GB Unallocated space generated adjacent and on the right side of C drive.

Unallocated created

Step 2: Right click C drive and select “Resize/Move Volume” again. In the pop-up window, drag the right border rightwards to hold the Unallocated space.

Extend C drive

Expand C

Step 3: Click OK, C drive was extended to 37.18GB by holding the 20GB Unallocated space. Click Apply on top left to execute, done.

C drive extended

Is it easy to shrink and extend volume in Windows 10? If there is not enough free space in volume D, you can get free space from any other volumes in the same disk, just need an additional step to move partition.

Note: Roll-Back technology and bootable CD/DVD/USB function are included in Professional edition, if you need these functions and get higher performance, you may consider Upgrade to it.

3 ways to extend volume in Windows 10 freely.
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