
On EFI systems, Windows can only be installed to GPT disks", it’s because your computer is booted in UEFI mode, but your hard drive is not configured for UEFI mode. The selected disk has an MBR partition table. If you receive the error message: " Windows cannot be installed to this disk. This option is not recommended because then you will not be able to use the PC’s UEFI firmware features. In other words, you convert GPT disk to MBR disk. Option 2: Delete all partitions on the hard drive, so you can use the MBR partition style. This option lets you keep the existing partition style and lets you use the PC’s UEFI firmware features. Option 1: Boot from the Windows 10 USB/DVD installation media in UEFI mode, so you can use the GPT partition style. You have two options when you get that error message. The selected disk is of the GPT partition style", it’s because your computer is booted in Legacy BIOS mode, but your hard drive is not configured for Legacy BIOS mode. You receive an error message when you try to install Windows 10 Here is an example of the one-time boot menu. On many computers, you can boot from the Windows 10 USB/DVD installation media either in UEFI mode or in Legacy BIOS mode. Legacy BIOS mode uses the Master Boot Record (MBR) partition style.

UEFI mode uses the GUID Partition Table (GPT) partition style.

The UEFI firmware supports two boot modes: UEFI mode and Legacy BIOS mode.
