GPT (GUID Partition Table) is a newer standard for disk partitioning that allows you to create unlimited partitions and enables you to fully use disks that are larger than 2TB. It is a layout of partition tables of a physical computer storage device, such as a hard disk drive or solid-state drive, using universally unique identifiers (GUIDs) . GPT is part of the UEFI standard, which means a UEFI-based system should be installed on a GPT disk. GPT allows users to create unlimited partitions and does not have a limitation on partition size. It is also safer and has better compatibility with modern hardware than MBR (Master Boot Record) .

MBR and GPT are two types of hard disk partition schemes. MBR disks use the standard BIOS partition table, while GPT disks use the Unified Extensible Firmware Interface (UEFI) . One advantage of GPT disks is that you can have more than four partitions on each disk. GPT is also required for disks larger than 2 terabytes (TB) .

When installing Windows on UEFI-based PCs using Windows Setup, your hard drive partition style must be set up to support either UEFI mode or legacy BIOS-compatibility mode. If you receive the error message "Windows cannot be installed to this disk. The selected disk is not of the GPT partition style," its because your PC is booted in UEFI mode, but your hard drive is not configured for UEFI mode.

In summary, GPT partition style is a newer standard for disk partitioning that allows you to create unlimited partitions and fully use disks that are larger than 2TB. It is required for UEFI-based systems and has better compatibility with modern hardware than MBR.