Troubleshooting Windows OS Migration with UEFI Mode and MBR Disk

It appears that you are encountering an issue with your system's disk partitioning, specifically with GPT mode, as both msinfo32 and diskpart command show no disks in GPT mode, and CSM is disabled. Here's a detailed explanation of the problem and potential solutions.

Problem Analysis

1. msinfo32 shows BIOS mode as UEFI.
2. cmd - diskpart - disklist shows no disks in GPT mode.
3. CSM (Compatibility Support Module) is disabled.

Possible Solutions

1. Convert MBR to GPT:

   • Backup all data on the disk.
   • Open Command Prompt as Administrator.
   • Type diskpart and press Enter.
   • Type list disk and press Enter to identify the disk.
   • Type select disk X (replace X with your disk number) and press Enter.
   • Type clean and press Enter to delete all partitions on the disk.
   • Type convert gpt and press Enter to convert the MBR disk to GPT.
   • Create new partitions using the create partition primary command.
   • Format the new partition using the format fs=ntfs quick command.

2. Enable CSM:

   • Restart your computer and enter the BIOS settings by pressing the appropriate key (usually F2, F10, F12, or Delete).
   • Look for a setting named "CSM," "Legacy," or "Compatibility Mode" and enable it.
   • Save and exit the BIOS settings.

3. Reinstall Windows:

   • If the above solutions do not work, consider reinstalling Windows. Make sure to backup all important data before proceeding.

References

• Microsoft Docs: Convert a disk from MBR to GPT (https://docs.microsoft.com/en-us/windows-server/administration/windows-commands/convert-gpt)
• Microsoft Docs: DiskPart (https://docs.microsoft.com/en-us/windows-server/administration/windows-commands/diskpart)
• Microsoft Docs: Clean Disk (https://docs.microsoft.com/en-us/windows-server/administration/windows-commands/clean)
• Microsoft Docs: Format (https://docs.microsoft.com/en-us/windows-server/administration/windows-commands/format)
• Technet: How to Enable CSM (https://www.tenforums.com/tutorials/3352-csm-enable-disable-uefi-bios.html)
• Technet: How to Convert MBR to GPT (https://www.tenforums.com/tutorials/2357-convert-mbr-to-gpt-disk-windows-10-a.html)
• Technet: How to Reinstall Windows (https://www.tenforums.com/tutorials/1639-reinstall-windows-10-a.html)