Windows 10: Convert SSD from MBR to GPT on Lenovo T450S laptop

Hi, my grandson recently sent me his LENOVO T450S laptop that would not boot. I quickly realized the spinner HDD was bad and installed a 120 GB Toshiba SSD. Since this was a new SSD to the T450S I used the "Media Creation Tool" to down load and install Windows 10 Pro and this was activated. The install of Win 10 went fine and booted right up. I then discovered that the T450S had a small 15 GB M.2 SSD. The W10 installed on the new SSD as a MBR drive. The 15 GB is also a MBR SSD with a "System Reserved" partition.
I would like to change the Toshiba SSD to a GPT as well as the 15 GB M.2 SSD. I don't care if all data/my files are deleted as I can install Win 10 again using the Media Creation Tool. I attempted this conversion using the Aomei Partition software but was warned that doing this MBR to GPT would make the T450S unbootable.
Is there a solution to this situation?

PS
All drivers and Windows 10 and the BIOS have been updated. And I have made a Reflect image backup on a USB. I also have backed to a separate USB any misc. files.

:)

 

Convert only one partition on the disk from MBR to GPT

Step 2
Convert MBR to GPT without data loss

 

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.

 

Convert only one partition on the disk from MBR to GPT

Follow the steps listed here on using GPTgen. He also lists how to create and restore backups.

Converting MBR to GPT without deleting your partitions