Comment convertir MBR en GPT sans perte de données sous Windows 10?

Table of Contents:

1. Introduction
2. Why Convert from MBR to GPT?
3. Understanding MBR and GPT Partition Modes
4. The Importance of Secure Boot for Windows 11
5. Step-by-Step Guide: Converting from MBR to GPT Without Data Loss
   • Checking the Current Partition Mode
   • Opening Command Prompt as Administrator
   • Executing the Conversion Command
   • Verifying the Successful Conversion
6. Configuring the Firmware for UEFI Boot Mode
   • Accessing BIOS Settings
   • Enabling Launch CSM and Boot Device Control
   • Setting Boot Options for Network, Storage, and Expansion Devices
7. Restarting the PC and Verifying Successful Boot
   • Saving BIOS Settings and Restarting
   • Checking Disk Management for GPT Partition
8. Troubleshooting Tips if Blue Screen Appears
   • Powering Off the PC for a Few Minutes
   • Restoring Default BIOS Settings
   • Selecting UEFI Mode and Restarting
9. Conclusion
10. FAQs

How to Convert from MBR to GPT Without Losing Any Data

In this article, we will guide You through the process of converting your SSD or HDD from MBR (Master Boot Record) to GPT (GUID Partition Table) without losing any data. We will explain why this conversion is necessary, particularly for the new Windows 11 operating system, which requires the Secure Boot feature. We will provide a step-by-step guide on how to convert your partition mode, configure your firmware for UEFI (Unified Extensible Firmware Interface) boot mode, and verify the successful conversion. We will also address common troubleshooting tips if you encounter any issues during the process.

1. Introduction

Technology advancements often require adjustments to hardware configurations to ensure compatibility and optimal performance. One such adjustment is converting the partition mode of your storage device from MBR to GPT. In this article, we will Show you how to make this conversion seamlessly while preserving all your data.

2. Why Convert from MBR to GPT?

Before diving into the conversion process, let's understand why it is necessary to convert from MBR to GPT. The primary reason for this conversion is for compatibility with the new Windows 11 operating system. Windows 11 introduces Secure Boot, a feature that enhances system security by only allowing trusted operating systems and their components to boot. If your storage device is in MBR mode and you enable Secure Boot, your Windows 11 installation may fail to boot properly, repeatedly directing you to the BIOS setup. To resolve this issue, you need to convert your storage device to GPT, which supports Secure Boot.

3. Understanding MBR and GPT Partition Modes

To comprehend the significance of converting from MBR to GPT, it is vital to understand the difference between these two partition modes. MBR (Master Boot Record) is an older partitioning scheme that supports up to four primary partitions and is limited to a maximum disk size of 2 terabytes. On the other HAND, GPT (GUID Partition Table) is a newer partitioning scheme that supports a virtually unlimited number of partitions and allows for larger disk sizes, making it more suitable for modern systems.

4. The Importance of Secure Boot for Windows 11

Secure Boot is a feature introduced in Windows 8 and continued in Windows 11 to enhance system security. When enabled, Secure Boot ensures that only trusted software components, such as the operating system and its drivers, are allowed to boot. This feature protects against bootkits and other malware that might attempt to tamper with the boot process. To take AdVantage of this security feature in Windows 11, you need to have your storage device configured in GPT mode.

5. Step-by-Step Guide: Converting from MBR to GPT Without Data Loss

Now, let's proceed with the step-by-step process of converting your storage device from MBR to GPT without any data loss. Make sure to follow the instructions carefully to ensure a successful conversion.

Checking the Current Partition Mode

Before initiating the conversion process, it is essential to verify the current partition mode of your storage device. This can be done by accessing the Disk Management tool on Windows.

1. Right-click on the Windows Start button and select "Disk Management" from the Context menu.
2. Locate your storage device (SSD or HDD) in the list of drives displayed.
3. Right-click on the device and select "Properties".
4. In the properties window, navigate to the "Volumes" tab and check the "Partition style" field. If it shows "Master Boot Record," your device is currently in MBR mode.

Opening Command Prompt as Administrator

To execute the conversion command, you need to open the Command Prompt with administrator privileges.

1. Type "cmd" into the Windows search bar.
2. Right-click on "Command Prompt" in the search results.
3. Select "Run as administrator" from the context menu.

Executing the Conversion Command

In the elevated Command Prompt, execute the conversion command using the built-in "mbr2gpt" tool provided by Windows. This tool enables you to convert the partition mode without data loss.

1. In the Command Prompt window, type the following command:

   mbr2gpt /convert /allowfullos

2. Press Enter to execute the command.
3. Allow the conversion process to complete. The duration may vary depending on the size of your storage device.

Verifying the Successful Conversion

After the conversion process is complete, it is important to verify that your storage device has been successfully converted to the GPT partition style.

1. Close the Command Prompt window.
2. Return to the Disk Management tool.
3. Locate your storage device and follow the previous steps to access the "Properties" window.
4. In the properties window, navigate to the "Volumes" tab and check the "Partition style" field. It should now display "GUID Partition Table (GPT)."

6. Configuring the Firmware for UEFI Boot Mode

To ensure the successful booting of your system after the conversion, you need to configure the firmware settings for UEFI (Unified Extensible Firmware Interface) boot mode.

Accessing BIOS Settings

1. Restart your PC and access the BIOS setup. The key to enter the BIOS may vary depending on your computer manufacturer (common keys include Del, F2, F10, or Esc). Refer to your system documentation for the specific key to access the BIOS.
2. Once inside the BIOS setup, navigate to the "Boot" section.

Enabling Launch CSM and Boot Device Control

To enable the Launch CSM (Compatibility Support Module) and set Boot Device Control to UEFI-only, follow these steps.

1. Locate the "CSM" or "Compatibility Support Module" option in the BIOS settings and select it.
2. Enable the "Launch CSM" option.
3. Look for the "Boot Device Control" or similar option and set it to "UEFI only."

Setting Boot Options for Network, Storage, and Expansion Devices

To ensure proper booting, configure the boot options for network, storage, and PCI-E expansion devices.

1. Locate the "Boot" or "Boot Options" section in the BIOS settings.
2. Set "Boot from Network Devices" or similar option to "Legacy Only."
3. Set "Boot from Storage Devices" or similar option to "UEFI."
4. Set "Boot from PCI-E Expansion Devices" or similar option to "Legacy Only."

7. Restarting the PC and Verifying Successful Boot

After configuring the firmware settings, save the changes and restart your PC. Verify that your system boots successfully into the Windows operating system.

Saving BIOS Settings and Restarting

1. Save the changes made in the BIOS settings by selecting the appropriate option (usually "Save and Exit").
2. Restart your PC as prompted.

Checking Disk Management for GPT Partition

After restarting, confirm that your storage device is still in the GPT partition style by checking the Disk Management tool.

1. Follow the steps Mentioned earlier to open the Disk Management tool.
2. Locate your storage device and verify that it displays "GUID Partition Table (GPT)" in the "Partition style" field.

8. Troubleshooting Tips if Blue Screen Appears

In some cases, you may encounter a blue screen after configuring the firmware settings. If this happens, follow these troubleshooting tips to resolve the issue.

Powering Off the PC for a Few Minutes

1. Turn off your PC completely.
2. Leave it powered off for a few minutes to allow any residual power to dissipate.
3. Power on your PC again and proceed to the next troubleshooting step.

Restoring Default BIOS Settings

If the blue screen issue persists, try restoring the default BIOS settings.

1. Enter the BIOS setup.
2. Locate the option to restore default settings (usually named "Restore Defaults" or "Load Setup Defaults").
3. Confirm the action and save the changes.
4. Restart your PC and proceed to the next troubleshooting step.

Selecting UEFI Mode and Restarting

If the previous troubleshooting steps did not resolve the blue screen issue, try selecting UEFI mode again and restarting your PC.

1. Access the BIOS setup.
2. Navigate to the boot settings section and confirm that the boot mode is set to UEFI.
3. Save the changes and exit the BIOS setup.
4. Restart your PC and check if the blue screen issue is resolved.

9. Conclusion

Congratulations! You have successfully converted your storage device from MBR to GPT without losing any data. By following this guide and configuring the necessary firmware settings, you can now enjoy the benefits of Secure Boot and ensure compatibility with the latest operating systems, such as Windows 11.

10. FAQs

Q: Can I convert from GPT to MBR using the same method outlined in this article? A: No, the method described in this article is specifically for converting from MBR to GPT without losing data. Converting from GPT to MBR requires a different procedure and will result in data loss.

Q: Do I need to back up my data before converting from MBR to GPT? A: While the conversion process itself should not result in data loss, it is always recommended to create a backup of your important data before making any changes to your storage device partitioning.

Q: What if I encounter an error during the conversion process? A: If you encounter an error during the conversion process, carefully review the steps and ensure that you are executing the command correctly. If the error persists, consult the Windows documentation or seek assistance from technical support.

Q: Is it possible to convert a system drive (C: drive) from MBR to GPT without reinstalling the operating system? A: Yes, it is possible to convert the system drive from MBR to GPT without reinstalling the operating system. However, this process requires additional steps and caution, as it involves critical system files. It is recommended to seek professional assistance or consult the Windows documentation for guidance.

Q: Can I convert a dynamic disk from MBR to GPT using the method outlined in this article? A: No, the method described in this article is not suitable for converting dynamic disks. Converting dynamic disks from MBR to GPT requires different tools and methods, which are beyond the scope of this article.