Convert Windows 10 from Legacy BIOS to UEFI without Data Loss  

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  1. Posts : 16
    Windows 10 x64
       #190

    NavyLCDR said:
    In a command prompt with admin, or powershell with admin run:

    reagentc /info

    Find Reset Recovery Image Location in Windows 10


    Thanks again

    I guess it's all good, disk 2 seems to be my OS disk.

    Convert Windows 10 from Legacy BIOS to UEFI without Data Loss-image.png


    Do you think I can remove the recovery partition on disk 3?
      My Computer


  2. Posts : 17,246
    Windows 11 Pro
       #191

    danteafk said:
    Thanks again

    I guess it's all good, disk 2 seems to be my OS disk.

    Convert Windows 10 from Legacy BIOS to UEFI without Data Loss-image.png


    Do you think I can remove the recovery partition on disk 3?
    I don't see a recovery partition on disk 3. I see an EFI System Partition.
      My Computer


  3. Posts : 16
    Windows 10 x64
       #192

    Can I remove it with diskpart? Or is UEFI using it actively?
      My Computer


  4. Posts : 17,246
    Windows 11 Pro
       #193

    danteafk said:
    Can I remove it with diskpart? Or is UEFI using it actively?
    I'm actually away from my computer for a while, so I can't verify the commands to tell what the computer booted from. I think it is:
    diskpart
    select disk 2
    detail disk
    select disk 3
    detail disk

    Only one of those should be listed as System Disk: yes. That would be the disk the computer is booting from. Going just from memory here, though.
      My Computer


  5. Posts : 16
    Windows 10 x64
       #194

    Thanks

    Convert Windows 10 from Legacy BIOS to UEFI without Data Loss-image.png


    So it seems the EFI partition is irrelevant on disk 3. Do you think I can delete it without issues?

    Convert Windows 10 from Legacy BIOS to UEFI without Data Loss-image.png
      My Computer


  6. Posts : 39,953
    windows 10 professional version 1607 build 14393.969 64 bit
       #195

    If you're not considering dual boot the EFI partition can be deleted on disk 3:
    Dual Boot Windows 10 with Windows 7 or Windows 8
      My Computer


  7. Posts : 17,246
    Windows 11 Pro
       #196

    I agree, you can delete the EFI System Partition on disk 3.
      My Computer


  8. Posts : 16
    Windows 10 x64
       #197

    Thanks so much to you all!!!!
      My Computer


  9. Posts : 1
    Windows 10 (2004/may2020)
       #198

    Hi, was hoping you might be able to help me with my little issue as well.

    Trying to convert from bios to uefi to enable the new resizeable bar feature for my gpu but keep bumping into one issue after another. At the moment I think the issue is the location of my System Reserved Partition on Disk 0 while the rest of my windows install resides on Disk 1.

    Convert Windows 10 from Legacy BIOS to UEFI without Data Loss-win11.jpg

    Disk 0 - 1TB sata ssd
    Disk 1 - 500GB m.2 sata ssd
    Disk 2 - 1TB NVME ssd

    As the mbr2gpt tool indicates the problem is:

    2021-04-01 15:22:39, Info MBR2GPT was explicitly asked to run in full OS mode.
    2021-04-01 15:22:39, Info MBR2GPT: Attempting to validate disk 1
    2021-04-01 15:22:39, Info MBR2GPT: Retrieving layout of disk
    2021-04-01 15:22:39, Info MBR2GPT: Initial partition information
    2021-04-01 15:22:39, Info ===========================================================
    2021-04-01 15:22:39, Info Partition layout for disk: 1
    2021-04-01 15:22:39, Info Partition style : MBR
    2021-04-01 15:22:39, Info MBR signature: 4292518833
    2021-04-01 15:22:39, Info Number of partitions : 2
    2021-04-01 15:22:39, Info ===================PARTITION===============================
    2021-04-01 15:22:39, Info Number: 1
    2021-04-01 15:22:39, Info Type: 7
    2021-04-01 15:22:39, Info Boot: No
    2021-04-01 15:22:39, Info Recognized: Yes
    2021-04-01 15:22:39, Info Style: 0
    2021-04-01 15:22:39, Info Offset: 1048576
    2021-04-01 15:22:39, Info Length: 499562212352
    2021-04-01 15:22:39, Info Volume: \\?\Volume{ffdaa3b1-0000-0000-0000-100000000000}\
    2021-04-01 15:22:39, Info Drive: C:\
    2021-04-01 15:22:39, Info NT Path: \Device\HardDisk1\Partition1
    2021-04-01 15:22:39, Info ===================PARTITION===============================
    2021-04-01 15:22:39, Info Number: 2
    2021-04-01 15:22:39, Info Type: 39
    2021-04-01 15:22:39, Info Boot: No
    2021-04-01 15:22:39, Info Recognized: Yes
    2021-04-01 15:22:39, Info Style: 0
    2021-04-01 15:22:39, Info Offset: 499563626496
    2021-04-01 15:22:39, Info Length: 541065216
    2021-04-01 15:22:39, Info Volume: \\?\Volume{ffdaa3b1-0000-0000-0000-505074000000}\
    2021-04-01 15:22:39, Info Drive: None
    2021-04-01 15:22:39, Info NT Path: \Device\HardDisk1\Partition2
    2021-04-01 15:22:39, Info ===========================================================
    2021-04-01 15:22:39, Info ESP partition size will be 104857600
    2021-04-01 15:22:39, Info MBR2GPT: Validating layout, disk sector size is: 512 bytes
    2021-04-01 15:22:39, Error ValidateLayout: Wrong boot partition count, expected 1 but found 0.
    2021-04-01 15:22:39, Error Disk layout validation failed for disk 1
    Just wondering how would I go about migrating/moving the System Reserved Partition to Disk 1 without losing the data on (C:) and (F:)?

    Also while Disk 0 and Disk 1 are both MBR at the moment Disk 2 indicates its already GPT , I hope that won't cause any issues going forward.
      My Computer


  10. T J
    Posts : 60
    10 Home 64-bit 21H2
       #199

    2012 1tb desktop; original Dell W7 partitions; NO clean installs; 2016 W7-W10 upgrade, now 20H2; BIOS updated. Recently restored a MR7 image to NEW similar 1tb SATA hard drive (due to old hd quit).

    validation completed successfully

    tried mbr2gpt /convert /allowfullOS & command prompt at boot; both had SAME conversion failure.

    thanks for any suggestions; this may be a Dell problem?

    I purchased AOMEI Partition Assistant Pro couple years ago; looks like it can convert disks (MBR to GPT or GPT to MBR), time to do more reading.

    Convert Windows 10 from Legacy BIOS to UEFI without Data Loss-dell-inspiron-660.jpg

    - - - Updated - - -

    AOMEI Partition Assistant 8.0 converted 3-partition hard drive (in Dell) from MBR to GPT.
    Now have UEFI and Secure Boot ON. also updated BIOS to a13 yesterday.
    Thanks Paul for getting me on the right track.
    Last edited by T J; 25 Jun 2021 at 11:51.
      My Computers


 

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