Windows 10: No boot disk found after converting disk to GPT

Converted the disk 0 after deleting all logical partitions on a Dell with UEFI ROM to GPT from MBR which has legacy mounted window 10 pro.

After changing Bios from Legacy to Uefi without secure mode, 'No bootable Disk found error message popped. Is there anyway to change the disk0 from GPT to MBR without loss of data or without losing windows 10. I have system image from the past and saved data.

:)

 

Converting a MBR disk to a GPT disk

I would put Windows on Disk 2. There is plenty of space. If you want to start with a clean slate then you should do this:

• Disconnect disks 0 and 1.
• Boot the machine with your installation medium.
• Launch diskpart.
• Select disk 0 (it was disk 2 before).
• clean.
• Reboot with your installation medium.
• Install Windows.
• When it runs nicely, connect the other disks and tell the BIOS which is the primary disk to boot from.

Since disk 2 is only 232 GBytes you will not need UEFI / GPT. After Windows is installed you can convert the 3 TByte disk to GPT.

 

convert MBR to GPT disk

convert mbr to gpt

There is a way to convert mbr to gpt without data loss. clean command deletes all datas inside the disk, so dont use this command

boot with windows dvd , and get into command prompt

type diskpart , find the disk number , which is need to convert mbr to gpt

say disk number is 0

exit diskpart

type below command in command prompt

mbr2gpt /convert /disk:0

wait for some minutes to complete , once you get commpleted successfuly means, exit and close ,

shutdown the pc , remove windows dvd

important

After the disk has been converted to GPT partition style, the firmware must be reconfigured to boot in UEFI mode.


Make sure that your device supports UEFI before attempting to convert the disk.

 

convert MBR to GPT disk

DISKPART> list disk

Disk ### Status Size Free Dyn Gpt
-------- ------------- ------- ------- --- ---
Disk 0 Online 465 GB 0 B
Disk 1 Online 7633 MB 0 B

DISKPART> list disk

Disk ### Status Size Free Dyn Gpt
-------- ------------- ------- ------- --- ---
Disk 0 Online 465 GB 0 B

DISKPART> select disk 0

Disk 0 is now the selected disk.

DISKPART> list partition

Partition ### Type Size Offset
------------- ---------------- ------- -------
Partition 1 Primary 549 MB 1024 KB
Partition 2 Primary 151 GB 550 MB
Partition 3 Primary 152 GB 152 GB
Partition 4 Primary 161 GB 304 GB

DISKPART> select partition 2

Partition 2 is now the selected partition.

DISKPART> clean

Virtual Disk Service error:
Clean is not allowed on the disk containing the current boot,

system, pagefile, crashdump or hibernation volume.

I am having above highlighted error while converting MBR to GPT disk .

please get me the solution.