Unable to Boot Windows 10 After Converting My Disk From MBR to GPT

Best Answered by

Roxanne· Answered on Jul 31, 2023

According to your question that you are unable to boot Windows 10 after converting my disk from MBR to GPT, I would like to share some useful information about the computer with you. It is believed that you will better understand why you cannot boot your Windows after converting from MBR to GPT.

First of all, you need to know the difference between the BIOS and UEFI modes. The BIOS is a piece of code residing on the motherboard which connects the hardware and software. This code has many limitations, such as limitations to partitions less than 2TB. At the same time, the UEFI is a new firmware type that is designed to replace the old style BIOS. It can support more than 2TB partitions as well as faster startup. In addition, the BIOS can only support the MBR disk, while the UEFI can only support the GPT disk.

Therefore, it is believed that you have understood the reason why you cannot boot your Windows 10 after converting your disk from MBR to GPT. After you finish the conversion of the disk from MBR to GPT, you need to enter into the motherboard's firmware to convert legacy to UEFI.

Usually, this process of switching from BIOS to UEFI requires you to hit one of the function keys, such as F1, F2, F3, F10, or F12, the ESC, or the Delete key as soon as you start your PC. These settings will differ, depending on manufacturers and even by computer model. Therefore, it is necessary for you to make sure to check your PC manufacturer's support website to learn more specific instructions.

After that, here are some steps for you to switch from BIOS to UEFI as follows:

After following the above steps, you will successfully achieve the switch from BIOS to UEFI. And then, you can boot your Windows 10 after converting the disk from MBR to GPT. Now you can try to fix your problem by using this method.

Read More: How to Know If Windows Using UEFI or Legacy