How to extend partition for Windows 10 computer

by John, Updated on: January 26, 2021

This article introduces how to extend volume in Windows 10 32/64 bit with native Disk Management, diskpart command and free 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 exists: system C drive runs out of space and getting full after running Windows 10 laptop or desktop 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 existing Unallocated space or free space in other volumes. In this article I'll introduce how to extend Windows 10 volume with 3 different tools.

1. How to extend partition in Windows 10 using DiskPart cmd

DiskPart is a text-mode command interpreter in Windows 10 and previous versions. This tool enables you to manage objects (disks, partitions, or volumes) by using scripts or direct input at a command prompt. Before extending Windows 10 partition with diskpart, there are several points you should know:

Steps to extend Windows 10 partition using DiskPart cmd:

Press Windows and R together on your keyboard, input diskpart and press Enter.

Diskpart command

Input list volume and you'll see all partitions in a list (Unallocated space is not shown).

List volume

Input select volume 1 to give focus to the system C: drive.

Select volume

Input extend to proceed extending.

Extend volume

If there's no Unallocated space next to C drive, you'll receive error message 'There is not enough usable free space on specified disk(s) to extend the volume.'

Cannot extend

To get such required Unallocated space, you must delete the contiguous D drive. To do this, run select volume D and delete volume commands one by one before step 3.

2. How to extend volume with Windows 10 Disk Management

If you think it's too difficult to extend Windows 10 partition with diskpart command, there's another native tool - Disk Management, which has graphic interface. It has Extend Volume Wizard, so you just need to click in the dialog box.

However, the same with Diskpart, there must be adjacent Unallocated space on the right side of the partition that you want to expand. That means, you must delete the right coniguous partition, too. The partition to be extended must be formatted with NTFS file system, too, otherwise Extend Volume is grayed out.

Steps to extend partition in Windows 10 using Disk Management:

  1. Press Windows and X together on your keyboard and click Disk Management in the list.
  2. Right click the right contiguous partition (such as D:) and select Delete Volume.
  3. Right click C drive and select Extend Volume.
  4. Simply click Next till Finish in the pop-up Extend Volume Wizard windows.

Extending complete

Unlike diskpart command, Disk Management cannot extend C drive after deleting D if D is a Logical drive. Remind again, do not delete D if you installed programs or any Windows services in it. Otherwise, the programs/services will stop working even if you move all files to other partition.

3. How to extend Windows 10 volume with free partition editor

Comparing with Windows native tools, NIUBI Partition Editor has advantages while extending partition for Windows 10 computer:

There are many free and commercial partition extender for Windows 10 laptop/desktop. But better than other software, NIUBI Partition Editor has unique 1-Second Rollback, Cancel-at-well and Virtual Mode technologies to protect system and data. It is 30% to 300% faster because of its advanced file-moving algorithm. It has free edition for Windows 10/8/7/Vista/XP (32/64 bit) home users. (Free edition is the same with professional edition except lacking of 1-Second Rollback and bootable media builder.)

Download this program, you'll see the main window with disk partition structure and other information on the right, available operations are listed on the left and by right clicking.

Main window

Steps to extend volume in Windows 10 laptop/desktop with NIUBI:

Step 1: Right click D: drive and select "Resize/Move Volume", drag left border towards right in the pop-up window, or enter an amount in the box of Unallocated space before.

Shrink D

Then D drive is shrunk and Unallocated space is made on the left.

Shrink D rightwards

Step 2: Right click C: drive 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 this Unallocated space.

Extend volume C

Step 3: Click Apply on top left to execute. (Real disk partitions won't be changed until click Apply to confirm).

Watch the videos how to extend system and data partition in Windows 10 laptop/desktop:

How to extend system partition C:

Video guide

How to extend data partition D:

Video guide

In Summary

Windows built-in Diskpart and Disk Management can only extend NTFS partition by deleting the right contiguous one. To extend volume in Windows 10/8/7/Vista/XP, NIUBI Partition Editor is better choice. Besides shrinking and extending partitions, it helps you do many other disk partition management operations such as merge, copy, convert, defrag, hide, wipe, scan bad sectors, etc.