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How to Combine Two Primary Partitions Together Without Losing Data

Updated on Nov 28, 2018 by Daisy to Partition Master

EaseUS Partition Master allows to combine/merge two primary partitions (including discontinuous primary partitions) into one without losing data. It works on GPT disk and MBR disk, supports OS: Windows 10/8.1/8/7/XP/Vista.

"The system partition is almost running out of space, and I decide to merge it with D: which holds plenty of free space (C;and D: are primary partitions). Remember that I don't intend to clear up D drive. Windows disk management won't allow me to combine two primary partitions directly. The only way to increase C drive space is to decrease D drive to get free unallocated space, and then add the space to C. As such, I still keep C: and D:, but one becomes larger while the other smaller. Is it possible to have one primary partition that contains both information of C: and D:?"

About Primary Partition

On MBR disk, you can create no more than four primary partitions, which can be used to install Windows operating system, and only one primary partition can be set as active to boot the operating system. Usually, C drive is what's set as active to take the responsibility. It does not mean that you can only have four partitions on a hard drive. You can have as many as you want. When partition a hard drive, set 3 primary partitions and one extended partition. On the extended partition, you're able to create multiple logical partitions, just for the use of storing personal data and files.

Partitioning hard drive into several chunks, as we call partitions or volumes, does some good regarding computer information organizing and managing. However, according to different demands on different partitions, space may not be allotted ideally and we may run into issues like c drive is out of space while others still have large space left. At this moment, some would like to resize partitions, while some choose to reduce one partition by combining it with the other requiring a certain amount of space.

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 Windows 10 is supported

How to Combine Two Primary Partitions into One with EaseUS Partition Master

So here we're going to help people merge two primary partitions into one without losing data on both sides. It's a good way to keep the original files, meanwhile, throw them into one enlarged volume. Now we need to use a straightforward partition freeware  - EaseUS Partition Master to complete the task. It works on primary partitions on both MBR disk and GPT disk and supports Windows 10/8.1/8/7/XP/Vista operating system.

Follow the step-by-step guide to merge two primary partitions


Step 1: Install and launch EaseUS Partition Master on your PC

Right-click on the partition which you want to add space to and keep on the hard drive, and select "Merge".

Run EaseUS partition manager software

Step 2: Select partitions to merge

1. Select one partition next to the former selected partition.
2. And click "OK" to continue.

Select partitions to merge

Step 3: Merge partitions

1. Click the "Execute Operation" button at the top and then click "Apply".
2. The program will merge space and add files from the second partition to the first partition.

Select partitions to merge
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 Windows 10 is supported