How to resize partition in Windows 10?
To many people, it is not an easy task to resize disk volumes in Windows 10, because my readers ask me many questions about it, such as: is it possible to resize the existing disk drive without reinstalling Windows 10? Which tool is better to resize Win10 partitions? Is it safe to do partition resizing, will it cause data damage? What is the right step to resize Windows 10 partition? So in this article I’ll introduce everything about Windows 10 partition resizing.
How partition resizing works?
A partition (also called as drive or volume) is just part of entire hard disk and there could be many partitions in a disk. A disk partition is used to store variety of files, including system and data files. To read and write files, there is a chain. Take MBR disk as example: Operating System read the parameters in MBR and then it knows how many partitions in this disk, the start and end position of each partition. From DBR of each partition, Operating System knows all the files record in this partition, from the record it knows the name, create date, type and other information of each file. To modify a file, Operating System simply modify the data area of this file, and then update the related record in DBR.
To resize a disk partition, it is much easier if it doesn’t require moving location of this partition. In this case, the partition tool just modify the parameters of start and end position of this volume. But if partition moving is required, it is much more complicated, besides updating partition position, the partition tool also move location of every file in this volume, and update the related record in DBR. After all files are moved and updated, other information in DBR and MBR should be updated, too.
In one word: partition resizing in Windows 10 is possible, but whether it is safe to do this, continue reading.
Which tools to resize Windows 10 partition?
There are two kinds of tools to resize volume in Windows 10: the built-in Disk Management snap-in and 3rd-party software. The advantage of Disk Management is born from Microsoft, but meanwhile it has many limitations. It is far behind the professional partition management software. However, some people insist on using Windows built-in utility, I also introduce how to resize partition in Windows 10 Disk management.
Resize partition in Windows 10 Disk Management
Resize partition means change the allocated size of existing volume, it could be decrease or increase partition size, so I have to divide into 2 sections.
Section 1 – Shrink a volume
1. Right click Windows on bottom left corner and select Disk Management.
2. Right click the volume and select Shrink Volume.
3. In the pop-up window, enter the amount of space to shrink, and then click Shrink to execute.
In a while, volume D was resized to 65.46GB.
Section 2 – Extend a volume
Note: only when there is adjacent Unallocated on the right side, you can expand a drive with Extend Volume function, otherwise, Extend Volume is greyed out.
- Right click D and select Extend Volume.
- Simply click Next in the pop-up Extend Volume Wizard window.
- Confirm the operation and click “Finish” to proceed.
In one word, Windows 10 Disk Management can only shrink a partition to generate Unallocated space on the right side. Extend Volume only valid when there is adjacent Unallocated space on the right side. If you want to shrink D to extend C, it is impossible. In this case, you need 3rd-party partitioning software.
Resize Window 10 volume with free partition manager
For Windows 10 users, there is free partition manager – NIUBI Partition Editor Free, which is most popular and highly recommended by professional editors.Download this free partition manager and you’ll see all connected disk partitions, the interface is similar with Disk Management.
Steps to resize Windows 10 partition with free partition manager:
Step 1: Right click D drive and select Resize/Move Volume.
In the pop-up window, drag left border rightwards to take free space out from D.
Click OK and back to the main window, as you see 20GB Unallocated space generated behind C drive.
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.
Step 3: Click OK and back to the main window, C drive was resized to 37.18GB by shrinking volume D. Click Apply on top left to execute, done.
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.
Video guide to resize Windows 10 volume
Pay attention to data safety while resizing partition
Data safety is most important, nobody likes to see system boot failure or data loss after resizing partition. NIUBI Partition Editor is only software integrated Roll-Back technology to keep data intact. It is able to roll back the computer to the right status before resizing automatically and in a flash, if any software error or hardware issue such as power failure occurred during resizing Windows 10 partition.