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MBR2GPT Cannot Find Room for the EFI System Partition

Facing low disk space on your EFI partition? Find solutions here to resolve this issue effectively.

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Updated on Jun 15, 2024

Users often get the problem notification "MBR2GPT cannot find room for the EFI system partition." when upgrading from BIOS to UEFI. Converting an MBR disk to a GPT disk to enable UEFI firmware leads to this problem. It is crucial to tackle this issue to smoothly transition and fully benefit from UEFI's features, including quicker boot times and improved security.

EaseUS will explain the causes of the "cannot find room for the EFI system partition" error and offer thorough solutions. Users can fix this issue and convert their drive to GPT by following the instructions, enabling UEFI upgrades.

How to Find Room for the EFI System Partition

This section will explore effective methods to resolve the issue of "cannot find room for the EFI system partition." EaseUS Partition Master is a flexible disk manager that can simplify disk conversion and ensure a smooth transition.

Way 1: Covert MBR to GPT using Prime Alternative to MBR2GPT

EaseUS Partition Master Professional is a more straightforward than the default MBR2GPT tool. This software can easily convert MBR to GPT in an effective, safe, and convenient way.

It is invaluable for fixing the "cannot find room for the EFI system partition" error. Its intuitive interface and excellent capabilities make it a popular choice for all skill levels.

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Step 1. Download and launch EaseUS Partition Master on your computer.

Step 2. Go to Disk Converter, select "Convert MBR to GPT" and click "Next" to continue.

convert MBR to GPT - 1

Step 3. Select the target MBR disk that you tend to convert to GPT, and click "Convert" to start the conversion.

convert MBR to GPT - 2

Way 2. Create Enough Free Space

The second approach is ensuring sufficient space on your disk for EaseUS Partition Master is distinguished since it comes equipped with a robust partition resizing tool. This feature enables users to resize or relocate existing partitions, which can be very useful when creating the EFI system partition without possibly losing data or disrupting the operating system's stability:

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Step 1. Go to Partition Manager, hover your mouse on target drive with low disk space, and click "Adjust with 1-Click".

When your partition is out of space and shows read, EaseUS Partition Master will pop up low disk space warning and offer "Adjust with 1-click" option.

how to fix low disk space on your drive or partition step 1

Step 2. Click "OK" to automatically extend partition. 

EaseUS Partition Master will extend the partition to solve the low space issue intelligently, and you only need to click "OK" to continue.  

how to fix low disk space on your drive or partition step 2

You can also click "Manual Adjustment" to extend the partition size manually if the Smart Space Adjustment cannot satisfy your needs. Then, click "OK" to continue.

how to fix low disk space on your drive or partition manually

Step 3. Execute operations to extend low disk space partition.

Click the "Execute Task" button at the top corner and keep all changes by clicking "Apply".

how to fix low disk space on your drive or partition step 3

Way 3. Extend the System Partition

In some cases, the system partition might be small to support the EFI system partition, and thus, expanding it is a possible option. This work is made easier by EaseUS Partition Master, which has a partition extension feature that allows this. This feature helps you to resize the system partition with or without the unallocated space:

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Option 1. Extend System C drive with unallocated space

  1. 1. Right-click on the System C: drive and select "Resize/Move".
  2. 2. Drag the system partition end into the unallocated space so to add it to the C: drive. And click "OK". 
  3. 3. Click "Execute Task" and "Apply" to execute the operations and extend the C drive.

Option 2. Extend System C drive without unallocated space

  1. 1. Right-click a big partition with enough free space on the system disk, select "Allocate Space".
  2. 2. Select the system drive at the Allocate Space From (*) To section, and drag the end of System C drive into the unallocated space. Click "OK" to confirm.
  3. 3. Click "Execute Task", it will list the pending operations, and click "Apply" to save the changes and extend the C drive.

0:00-0:26 Extend System Drive with Unallocated Space; 0:27-0:58 Extend System Drive without Unallocated Space.

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Other Features of EaseUS Partition Master

In addition to resolving the issue of not being able to find room for the EFI system partition, EaseUS Partition Master provides a range of other useful features. These abilities encompass:

We highly recommend users test out EaseUS Partition Master to fix the "cannot find space for the EFI system partition" issue and utilize its various partition management functions.

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Way 4. Run the MBR2GPT Command in WinRE

Utilizing the MBR2GPT command in WinRE is a useful solution for the "cannot find room for the EFI system partition" problem. This technique requires utilizing a Windows tool that is already included to change your disk from MBR to GPT. To finish the procedure, adhere to the following steps:

  • Go to the boot menu after restarting your computer.
  • Click on "Troubleshoot" and then "Advanced options."
  • Input "mbr2gpt /validate" after selecting "Command Prompt."


  • Press "Enter" after typing "mbr2gpt /convert" if the validation is successful.
  • Restart your computer and navigate to the BIOS/UEFI settings after the conversion.
  • Switch to UEFI from Legacy boot mode.


If your MBR2GPT cannot find room for an EFI system partition error is solved by using these solutions. Don't forget to share them with other users in need:


Why MBR2GPT Cannot Find Room for the EFI System Partition

Now, one might wonder why this frustrating issue occurs. Here are some common reasons 

  • Insufficient Unallocated Space: The EFI system partition (ESP) needs 100 MB to 300 MB. If all partitions fill the disk, there may not be enough unallocated space for the ESP.
  • Fragmented Free Space: Even if the disk has ample free space, it may be fragmented. ESP requires a contiguous space block, which fragmented free space cannot provide.
  • Too Many Primary Partitions: MBR is limited to four primary partitions. The GPT-required EFI system partition cannot be created if all four primary partitions are used.
  • Hidden Partitions: Some disks have hidden partitions utilized by system recovery tools or other programs. Hidden partitions take up ESP space, which can slow conversion.
  • Misconfigured Boot Settings:  Misconfigured BIOS or UEFI boot settings can also prevent the creation of EFI system partitions. These settings must be adjusted appropriately for partition modifications.

First, understand these causes to fix the "cannot find room for the EFI system partition" issue.


This article addresses the MBR2GPT tool's inability to locate an area for the EFI system partition. We discussed the importance of migrating from MBR to GPT and suggested EaseUS Partition Master as a flexible alternative. We then described using EaseUS Partition Master to convert MBR to GPT, create enough free space, and extend the system partition. We also supplied a WinRE MBR2GPT command tutorial.

EaseUS Partition Master is recommended to fix the "cannot find room for the EFI system partition" error. Its easy-to-use interface, extensive capabilities, and consistent performance make it a great disk partition manager and MBR to GPT converter. 

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FAQs About Cannot Find Room for the EFI System Partition.

Here are some commonly asked questions regarding this issue

1. How do I fix the fact that no EFI system partition was found?

Make sure your disk is GPT, not MBR. If necessary, you can check it and convert it using EaseUS Partition Master.

Step 1. Make sure your disk has 100–300 MB of free space. You can resize them if needed.

Step 2. Launch Command Prompt as an administrator. Run the given command.

  • diskpart
  • list disk
  • select disk 
  • create partition efi size
  • format quick fs=fat32 label="EFI"
  • assign letter
  • exit

Step 3. Use the Command Prompt C:\Windows /s S: /f bcdboot UEFI

Following these steps should assist you in resolving the error "no EFI system partition found." To achieve a better user experience, think about utilizing EaseUS Partition Master.

2. How do I access the EFI system partition?

Follow these steps to access EFI system partition

Step 1. Use DiskPart and open Command Prompt as an administrator.

Step 2. Insert this command:

  • DiskPart
  • List volume
  • Assign -R 
  • exit

Step 3. Navigate to the recently assigned drive letter in File Explorer.

3. How do I fix low disk space on my EFI partition?

Follow these steps to fix low EFI partition disc space:

  • Resize and add space to the EFI partition with EaseUS Partition Master.
  • Remove unneeded EFI partition files to clear up space. Avoid deleting vital system files.
  • Move non-essential files from the EFI sector to another disc partition to save space.
  • Use EaseUS Partition Master to increase the EFI partition size when switching from MBR to GPT.

These steps will fix low disc space on your EFI partition and improve system performance.

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About the Author

Updated by Roxanne

Roxanne is one of the main contributors to EaseUS and has created over 200 posts that help users solve multiple issues and failures on digital devices like PCs, Mobile phones, tablets, and Macs. She loves to share ideas with people of the same interests.

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