Increase partition size

How to change partition size in Windows 10

When system C drive is running out of space, nobody wants to start from scratch, so many people search by Google to find a better way. In technical forums, many people have similar questions such as: is it possible to change partition size in Windows 10 directly, is it safe to re-size partition, which tool is better to change Windows 10 partition size. The answer is definitely yes. To change partition size on Windows 10, there are 2 options: Windows built-in Disk Management and third party professional partition software.

Resize partition Windows 10

Windows 10 Disk Management inherited Shrink Volume and Extend Volume functionalities from previous Windows version. Shrink Volume can decrease the size of both system C drive and data volumes. Extend Volume can increase size of a drive when there is adjacent Unallocated space. Both functionalities are safe to change partition size in Windows 10 (32 & 64 bit). However, if you want to extend a volume by shrinking another one, it is impossible.

Because of the inherent limitations, Windows Disk Management is not the best tool to resize partitioned drives. Professional partition software is much more powerful, but you’d better select a safe one, otherwise, there is system damage and data loss risk. In this article, I’ll introduce how to change partition size on Windows 10 with both native Disk Management and partition software.

Change partition size with Windows Disk Management

How to decrease partition size:

Step 1: Right click Windows on bottom left of the screen and select Disk Management.

Step 2: Right click the drive you want to decrease and select Shrink Volume.

Shrink volume

Step 3: Enter the amount of space to shrink (1024MB=1GB) and click Shrink to execute.

Enter amount

In a while, this drive is shrank.

Volume shrank

Shrink Volume limitations:

  1. Only NTFS partition can be shrank, FAT32 and other types of volumes are not supported.
  2. Unallocated space can only be generated on the right side.
  3. Sometimes you can only shrink little space because of some unmovable files are located, even though there is large amount of free space in this drive.

How to increase partition size:

Only when your disk drive configuration meet the requirements, Extend Volume is workable, otherwise, you need professional partition software.

  1. There must be adjacent Unallocated space on the right side of the drive that you want to extend.
  2. The drive you want to extend must be NTFS, FAT32 and other types of partitions are not supported.
  3. In MBR disk, Logical partition cannot be extended even if there is right adjacent Unallocated space.

It is very easy to use Extend Volume:

  1. Open Windows 10 Disk Management.
  2. Right click the NTFS partition that has right adjacent Unallocated space and select Extend Volume.
  3. Simply click Next in the pop-up Extend Volume Wizard.

Change partition size with partition software

As I said above, it is very important to select a safe and reliable partition software to resize partition, otherwise, there is data loss and/or system damage risk. Equipped with unique 1 Second Rollback technology, NIUBI Partition Editor can protect system and data intact, it automatically roll back to original status in ONE second if any software or hardware issue occur while resizing disk partitions. This is the reason why it is highly recommended by many editors and users.

Comparing with Windows 10 Disk Management, NIUBI Partition Editor has many advantages while resizing partition, for example:

  • Both NTFS and FAT32 partitions are supported to shrink and extend.
  • Unallocated space can be generated on either side when shrinking a drive.
  • Partitions can be easily extended with adjacent Unallocated space on either side.
  • Nonadjacent Unallocated space or free space inside of a volume can be moved and combined to other partition in the same disk.

How to change partition size in Windows 10 with NIUBI:

Download NIUBI Partition Editor and you’ll see all connected storage device with partition layout. In my Windows 10 laptop, there are drive C, D, E and several system reserved partitions.

Increase C drive Win10

How to shrink drive:

Right click drive D and select Resize/Move Volume, drag either border towards the other side.

Shrink D drive

If you drag left border towards the right, Unallocated space will be generated on the left side of drive D.

Unallocated space

How to extend drive C:

Right click C drive and select Resize/Move Volume, drag the right border rightwards in the pop-up window.

Extend C drive

Unallocated space will be added into C drive.

C drive increased

Tips: To change physical disk partition, you must click Apply on top left to execute.

If Unallocated space is behind D, you can move it to behind C by dragging middle position in the pop-up window.

Move Unallocated space

Besides resizing and moving partition, NIUBI Partition Editor can help you do many other operations such as: merge, convert, defrag, copy, repair, wipe and scan partition. Initialize, convert, set read-only attribute to disk, etc.

Download to try