Share via

ERROR: "Cannot find OS partition(s) for disk 1"

Anonymous
2025-05-13T20:17:02+00:00

Hello!

I am trying to enable secure boot to upgrade to windows 11, but I have to convert my boot drive from mbr to gpt. However when I try to do this via the mbr2gpt program I get this error message. Could anyone help me? I would like to convert without having to backup or clear my boot drive.

Windows for home | Windows 10 | Install and upgrade

Locked Question. This question was migrated from the Microsoft Support Community. You can vote on whether it's helpful, but you can't add comments or replies or follow the question.

0 comments

13 answers

Sort by: Most helpful
Most helpful Newest Oldest
  1. Anonymous
    2025-05-14T07:54:00+00:00

    I am answering from a different account, but I am OP. I tried this, and now it doesn’t boot anymore, what should I do:

    0 comments
  2. Anonymous
    2025-05-14T08:03:39+00:00

    Please enter your BIOS settings page and change the boot order such that the system boots from Disk 1. By the way, the disk's model number would appear in the BIOS settings. Select the 120 GB disk (which is Disk 1) from the list.

    0 comments
  3. Anonymous
    2025-05-14T08:12:38+00:00

    By the way, if you've successfully completed the GPT conversion using MBR2GPT, switch to UEFI mode and turn off CSM support.

    How to Enter the BIOS on Any PC: Access Keys by Manufacturer | Tom's Hardware: https://www.tomshardware.com/reviews/bios-keys-to-access-your-firmware,5732.html

    0 comments
  4. Anonymous
    2025-05-14T08:18:58+00:00

    I did this, but it still won’t work:

    0 comments
  5. Anonymous
    2025-05-14T08:23:29+00:00

    Some questions:

    Did bcdboot report any errors?

    Did you convert from MBR to GPT using MBR2GPT, and did it report success? Or, did you only run "mbr2gpt /validate"?

    Can you boot into legacy mode from that 120 GB disk?

    0 comments