Trying to reformat MBR to GPT on new m.2

Hi, i recently bought a m.2 so i could transfer or reinstall my OS onto it.

I formatted it with no issues and tried

C:\WINDOWS\system32> mbr2gpt /validate /disk:0 /allowfullos
MBR2GPT: Attempting to validate disk 0
MBR2GPT: Retrieving layout of disk
MBR2GPT: Validating layout, disk sector size is: 512 bytes
Disk layout validation failed for disk 0

i shrunk the formatted volume by 700mb and i still have the same error.

Could i get some support please?

Cheers :)

See if this works:

Code:

diskpart
lis dis
sel dis 6 (replace 6 with the actual number for the disk drive)
det dis (make sure that the applicable disk drive was selected)
clean
convert gpt
create part pri
format fs=ntfs
assign
exit
exit

Or you can just use diskpart built-in to Windows:

Code:

diskpart
list disk
select disk # <-replace # with the actual number for the SSD
clean <- this will ERASE the disk (SSD) selected above, make sure you selected the correct disk!
convert gpt
exit
exit

If you are going to install an OS on the SSD, you do not want to format it. You want it to be unallocated space.

The MBR2GPT command will only work on a bootable drive with an OS installed, it will not work on a data drive. MiniTool Partition Wizard Free can convert MBR to GPT on a non-bootable data disk without losing data.

zbook said:

See if this works:

Code:

diskpart
lis dis
sel dis 6 (replace 6 with the actual number for the disk drive)
det dis (make sure that the applicable disk drive was selected)
clean
convert gpt
create part pri
format fs=ntfs
assign
exit
exit

That worked :)

Thanks so much!

Now for my OS, do i need to reinstall it using a boot drive or is there a way to transfer the OS onto my m.2 without full reinstallation?

If you had created a backup image or if you can create one now you can then restore the image onto the new drive.
(licensing / activation is easy if it's the same motherboard / computer)
(This includes applications, drivers, personal files, etc.)

If there is no backup image then you may be able to copy the primary partition using Minitool partition wizard.
(The EFI partitions can be manually created using command line.)

If the above options are not available then clean install.


Macrium Software | It’s our business to protect your data
Backup and Restore with Macrium Reflect


Clean Install Windows 10

https://www.microsoft.com/en-us/soft...load/windows10
Download Windows 10 ISO File
Create Bootable USB Flash Drive to Install Windows 10

idkwhatimdoing said:

That worked :)

Thanks so much!

Now for my OS, do i need to reinstall it using a boot drive or is there a way to transfer the OS onto my m.2 without full reinstallation?

You can clone the old drive to the new drive.

Josey Wales said:

I have always formatted the DDS before install. It worked every time.

I have never formatted the SSD before install. It's also worked every time. The clean install tutorial on Tenforums recommends installing to a drive that is NOT formatted whenever possible and I agree.

Its personal preference, really, but I have seen a lot more problems from users (usually lesser experienced) that have tried to format first themselves rather that leaving the drive blank. This exact thread, for example.