New Windows 10 computers use UEFI firmware instead of the traditional BIOS. As you probably noticed when using a MBR-partitioned Windows installation USB drive on a new Windows 10 PC, UEFI will not recognize it as a boot media. UEFI-based computer can only boot from GPT-partitioned USB drive. Luckily, for backward compatibility most of the UEFI systems can also be configured to disable UEFI secure boot and instead revert to legacy BIOS boot mode. In this tutorial we’ll explain how you can easily create a UEFI or legacy bootable USB drive for Windows 10 Setup.
How to Create UEFI or Legacy Bootable USB Drive for Windows 10 Setup
If you have the Windows 10 ISO image on your PC, you can choose to make a Windows 10 bootable USB drive with UEFI or legacy bootloader. 64-bit UEFI PC can only boot 64-bit version of Windows 10, while 32-bit UEFI PC can boot 32-bit OS only. So if you want to install Windows 10 with UEFI mode, you have to download a correct version of Windows 10 ISO image.
Before get started, make sure you backup all important files stored in your USB drive. The process of creating a bootable USB drive will erase all data and re-partition your USB drive.
Otherwise choose “MBR (for legacy BIOS / CSM boot)” for BIOS-based PC, or UEFI computer running in legacy BIOS/CSM mode.
Quick note: You want to do this before creating the bootable media because there is a good chance that the drive was formatted using a Windows device. If this is the case, the chances are that it’s using an MBR partition, and the USB drive needs a GPT partition to work on a Mac. To create a bootable USB flash drive. Insert a USB flash drive into a running computer. Open a Command Prompt window as an administrator. In the new command line window that opens, to determine the USB flash drive number or drive letter, at the command prompt, type list disk, and then click ENTER. Make bootable USB Flash Disk for macOS with Latest Clover bootloader revision. Download(with resuming) Latest! Apple Recovery HD package,Extract HFS-Image and Restore it with BDU. Automatically Check/Download the Latest Clover Rev.and Use Zip and LZMA archives in Local Repository with existing Clover Rev.
Of course, there are also some other USB creation tools available on the net, such as Rufus. It also allows you to create UEFI or legacy bootable USB installation drive from Windows 10 ISO image.