Convert Windows 10 from Legacy BIOS to UEFI without Data Loss  

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.




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

danteafk said:

Thanks again

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




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.

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

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.

Thanks




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

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

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

Thanks so much to you all!!!!

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.



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.