Software⏱️ 3 min read📅 2026-06-11

How to Fix: Deleted my EFI/MS & MSR partitions by error, how to rebuild it?

Rebuilding EFI/MSR partitions after accidental deletion.

Quick Answer: Use a Windows installation media to run the bootrec command with the /rebuildmbr option, then try booting into Windows again.

📋 Table of Contents

  1. 🛑 Root Causes of the Error
  2. 🚀 How to Resolve This Issue
  3. 🎯 Final Words

The user has deleted all partitions except the one with Windows installed, resulting in an error when booting. This issue affects users who rely on their computer's EFI/MSR partitions for functionality and data storage.

Rebuilding the EFI/MSR partitions can be a time-consuming process, but it is possible to recover the lost data. The goal of this guide is to provide step-by-step instructions for rebuilding the EFI/MSR partitions using different methods.

🛑 Root Causes of the Error

  • The user's mistake of deleting all partitions except the one with Windows installed can cause theEFI/MSR partition issues. This error occurs when the operating system relies on these partitions for booting and data storage.
  • Another possible reason is that the user may have deleted the wrong partition, causing the EFI/MSR partition to be lost.

🚀 How to Resolve This Issue

Rebuilding EFI/MSR Partitions using Bootrec

  1. Step 1: Insert the Windows installation media (Tiny10) into the computer and boot from it.
  2. Step 2: Open a Command Prompt window by pressing Shift + F10 during boot. This will allow you to run bootrec commands.
  3. Step 3: Run the following command: `bootrec /fixmbr` to fix the master boot record.
  4. Step 4: Run the following command: `bootrec /rebuildbcd` to rebuild the BCD store.
  5. Step 5: Run the following command: `bootrec /sall` to scan all disks for a valid operating system.
  6. Step 6: If a Windows installation is found, run the following command: `bootrec /install {version} /forceappx` to install the Windows installation.

Rebuilding EFI/MSR Partitions using Linux and GParted

  1. Step 1: Insert the Linux live media (MX Linux) into the computer and boot from it.
  2. Step 2: Open the GParted utility to manage disk partitions.
  3. Step 3: Create a new partition on an empty drive using FAT32 or FAT16 with the ESD flag set. This will create a new EFI/MSR partition.
  4. Step 4: Repartition the Windows installation partition to use the entire drive, if necessary.

🎯 Final Words

Rebuilding the EFI/MSR partitions can be a complex process, but it is possible to recover lost data and functionality. By following these steps, users can regain access to their computer'sEFI/MSR partitions and restore their operating system.

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