4

My laptop (Lenovo v470) has a pre-installed Windows 7, but it doesn't start up and also startup repair doesn't work (missingosloader error). I want to re-install Windows 7 but all partitions are MBR and boot mode is UEFI and I get the error 

Windows cannot be installed on this disk. The selected disk has an MBR partition table. On EFI systems, Windows can only installed on GPT disks."

I don't want to lose my data and I know there are approaches to change MBR to GPT without losing data but I don't want to take that risk. So I decided to change boot mode to Legacy. Unfortunately, in bios setup > boot menu, there is no boot mode option to change (not even disabled option). I can just change bootable media priority.

Is there any way to change boot mode through Ubuntu live or recovery command prompt?

Edit: Boot Menu that doesn't have boot mode. Boot Menu

Configuration tab Configuration Menu

Information tab BIOS information tab

Security tab BIOS security tab

Exit tab BIOS exit tab

Vahid
  • 51

1 Answers1

1

To sum up the discussions in the comments, I should use Linux Live USB/CD to backup my files and then convert MBR disk to GPT (there are lots of tutorials for that with and without losing data). For others that have the same issue, I suggest to consider F9 (Setup Defaults in the BIOS) and updating firmware as potential solutions (need to be investigated well). At the moment, I want to do backup and then MBT to GPT conversion.

Vahid
  • 51