How to check whether Win 10 is started by UEFI or legacy BIOS?

1. Right-click my computer/computer/laptop on the desktop and select Manage-Disk Management;

2. Right-click disk 0. If there is "Convert to MBR Disk" in the pop-up menu, it is started by UEFI, and if it is converted to GPT, it is a traditional BIOS.

Method 2:

1. Press win+r to start running, enter msinfo32, and confirm to open the system information;

2. Check whether the BIOS mode is UEFI.