I have 2 partitions, one of which is unallocated, that I want to merge. Unfortunately, there is an EFI partition in between the two. Is there any way to merge these two partitions together without destroying my ability to boot?

That 750mb one is labeled as (EFI boot partition).

enter image description here

  • Unallocated areas are not partitions: they're the absence of a partition.
    – user1686
    Feb 3, 2021 at 20:33

2 Answers 2


Use something like GParted LiveCD to move the partition elsewhere. The firmware doesn't care about the EFI partition's exact position (since that's always discoverable from the partition table), it only cares about its unique GUID. GParted will preserve the partition's GUID when moving.

(Technically, there is also the option of creating a new EFI system partition and deleting the old one, using Windows built-in tools such as diskpart and bcdboot. It's slightly risky.)

  • can I accomplish this via a ubuntu liveusb session? Is there a more detailed writeup on how to do this?
    – Tuatarian
    Feb 3, 2021 at 21:45
  • Yes, GParted is available on Ubuntu (or was last time I checked in 2018). Since you're dealing with unallocated space, just move the EFI partition all the way to the right (i.e. end of the disk).
    – user1686
    Feb 3, 2021 at 23:04

You only have two partition followed by an unallocated space. To append the unallocated space to C, it must immediately follow C. You may then use the Disk Manager inside Windows to extend C.

This means that you need to move the 750MB partition to the end of the disk so that it will look like this:

enter image description here

You may use for that a partition editor. Examples are Macrium Reflect Free Edition or Clonezilla. and some more are found here.

As with partition editing you take the risk of making the disk unusable, it's better to take an image backup of the system disk using a product such as AOMEI Backupper Freeware, and to make a bootable media, and test booting it to see that it can see both the hard disk and the backup image, just in case you will want to restore the last working version of Windows.

Another tool is MiniTool Partition Wizard Free that also has good tutorials.
Start at How to Move/Resize Partition

  • How do I accomplish the things in the last paragraph?
    – Tuatarian
    Feb 3, 2021 at 21:44
  • I added another free tool that has good tutorials.
    – harrymc
    Feb 4, 2021 at 7:02

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