How Can I Merge Disk 0 and Disk 1 in Windows 10

Brithny updated on Sep 23, 2019 to Partition Manager | How-to Articles

"There are three disks on my computer. The disk 0 is almost full because I often use it to save and back up terabytes of data. However, my disk 1 has lots of free space. I wonder, can I merge disk 0 and disk 1 to get more space for my disk 0? Can I move unallocated space on disk 1 to disk 0?" 

Most users may have experienced the same kind of problem that one of their disks gets full while the other one has lots of unallocated space. The best choice to make full use of all space is to merge the two disks.

On this page, we'll show you how to effectively merge disk 0 and disk 1 (just two disks) with ease. You can also use the provided method on this page to merge even more disks on Windows PC.


# 1. Download reliable partition manager software 

Professional partition manager software - EaseUS Partition Master can help you effectively merge two disks, allowing you to make full use of disk space.

Download Now

 Windows 10 is supported

# 2. Make sure the second disk contains enough unallocated space

As long as the second disk contains unallocated space, you can add it to the target disk, extending partitions.

Important Tips:

  • 1. It doesn't support to merge external hard drive or devices. Only internal hard disks can be merged as one disk. 
  • 2. Only unallocated space can be merged into another disk. 
  • 3. It doesn't support to expand C drive across two hard disks.

Guide: Merge Two Disks as One in Windows 10

You just need two steps and you can merge the two disks. First, convert the two disks into dynamic disks. Second, merge the two disks.

Now, let's start to merge two disks in Windows 10:

Step 1: Convert Basic into Dynamic

Launch EaseUS Partition Master and right-click one of the disks (disk 0, disk 1 or disk 2) that you want to merge, choose "Convert to Dynamic".

choose the first disk and convert to dynamic

On the home menu, click "Execute Operation" to confirm the disk conversion from the Basic to Dynamic.

click apply to convert to dynamic

Select the other disk (with lots of free space) and convert it to a dynamic disk in the same way.

convert the second disk into dynamic

When both of the disks have been converted into dynamic disks, as shown below, you can follow Step 2 to merge free space from one disk to another now.

convert the second disk into dynamic

Step 2: Merge Two Disks into One Disk

Select the full disk, right-click on it and choose "Resize/Move".

Note: The other dynamic must be unallocated space. If it's not, delete all the partitions on it. What's more, you cannot convert a system disk to a dynamic disk.

choose the disk and resize

Use your mouse to drag the partition panel rightward or leftward to extend partition size.

Sometimes, the unallocated space is on the left of the partition you want to extend. If you want to move unallocated space, just drag the left partition handle leftwards to the size you want.

resize the disk

Click "Execute Operation" and you are able to merge space from one disk to the other.

merge two disks space into one
Download Now

 Windows 10 is supported


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Frequently Asked Questions

Why Choose EaseUS Partition Master?

"I've used Partition Master Professional many times to create, delete, format, move, rename, and resize partitions."PCWorld

"Partitioning tools have come a very long since the days of complicated command line utilities and EASEUS Partition Master is one of the most advanced programs available."TECH ADVISOR

"I love that the changes you make with EaseUS Partition Master Free aren't immediately applied to the disks. It makes it way easier to play out what will happen after you've made all the changes."Lifewire

Will the "Migrate OS" feature transfer the Windows system files only or the whole C drive?

To ensure that the migrated system will boot normally, the Migrate OS feature will transfer all the files in the system and the boot partitions. Generally, the boot partition is the C drive so the transfer will include all the files in C.

Does EaseUS Partition Master license apply to multiple computers?

The license of Partition Master Professional and Server editions can be used on 1 computer only, while that for for the Technician and Unlimited editions can be used on multiple machines.

What is the difference between EaseUS Partition Master Trial version and the Free version?

Free is for home users only, with most basic functions available such as partition resize and clone. While trial can help you understand how this product works and test what a full license can do on a business or server OS machine.

Will it cause any data loss after resizing the partition in EaseUS Partition Master?

Generally, it will not cause any data loss or boot issue by resizing a partition. However, in order to protect your data, we suggest that you backup the partition before resizing, in case of any unexpected situations such as power outages, computer hardware failures, etc. You can use EaseUS Todo Backup to backup the partition and its trial version is fully functioned for 30 days.

What should I prepare before resizing the partition?

On the partition that is going to be operated, there might be some files being occupied by other programs. To ensure a successful operation, we suggest that you close all the unnecessary software before resizing that partition. Otherwise, EaseUS Partition Master will detect the partition being locked by the other software and require a reboot to resize the partition under boot mode.

About EaseUS Partition Master

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