Windows 10: Windows on Legacy GPT

Help i switched from mbr legacy to gpt legacy, i accidentally deleted windows boot partition its main partition is intact, it was arch linux dual boot, i cant even boot windows 10 usb install, i can boot arch, how i can enable booting windows

:)

 

Cannot convert GPT to MBR.

Hi Michael,



I suggest you to follow the below steps and check if it helps.

This method you have to backup all your data and delete all partitions and volumes. Then use the
DISKPART command.

• Open command prompt and type in DISKPART and press Enter
• Then type in list disk (Note down the number of disk you want to convert to GPT)
• Then type in select disk number of disk
• Finally type in convert gpt.

Hope the information helps. Do reply if you need further assistance.

 

install using gpt, uefi required?!?


The real answer is sort of .. on a Legacy boot, you can initialize the drive as GPT and you can dism install Windows
BUT... you lose recovery (and possibly more things) - the hidden/backup MBR in GPT drives isn't the same as a true MBR.

I suggest using an extended partition and logical drives on a Legacy boot system.
3 Primary parts, one Extended part(with as many logical drives as you deem needed).

I'd have to see your Disk Management to advise further.

Step 1: Download this zip file (contains dmDskmgr-vd.mmc)

dmDskmgr-vd.zip
Step 2: Double click dmDskmgr-vd.zip to open the compressed folder
Double click dmDskmgr-vd.mmc to launch the custom Disk Management console
You'll get an output similar to this:




Press Alt+PrtScn to grab a snapshot of just the Disk Management window
Open Paint and Ctrl+V to paste it, then save the image
Attach the image to a new post.
Option 2: Use Disk Management in the x-Menu (right click the Windows logo, select Disk Management)
Select View > Bottom > Disk list
Maximize the window and grab the screen shot.

 

Most Drives disappear when disselecting "Legacy + UEFI". Do i need to reinstall windows?

Hi, I’m Nicole, I’ll be happy to help you out today.

The first method will need to reinstall Windows after converting the drive from MBR to GPT so it can work in UEFI mode. Here are the steps.

1. After you convert Legacy BIOS to UEFI boot mode, you can boot your computer from a Windows installation disk.

2. At the Windows Setup screen, press Shift + F10 to open a command prompt.

3. Type “diskpart” and use the command “list disk-> select disk #-> clean->convert gpt” to convert the disk from MBR to GPT. On select disk, select your m.2 drive number.

4. Now, you can go back and reinstall Windows. If you try to install Windows without these steps, you will get the error “Windows cannot be installed to this disk” after you change BIOS to UEFI mode.

The second method is changing the boot mode from Legacy to UEFI without reinstalling Windows but you may need to use a 3rd party application. You can follow this link.

https://www.diskpart.com/gpt-mbr/change-legacy-...

Update me on this issue.

Thank you.