GPT (GUID Partition Table) is a partitioning scheme that defines how storage drives divide into separate sections for different operating systems, applications, or data. It replaces the older Master Boot Record (MBR) standard, which became limiting as hard drives grew larger.
Why GPT matters:
- Handles drives larger than 2TB without workarounds, whereas MBR maxes out at 2TB.
- Supports up to 128 partitions by default, compared to MBR's 4 primary partitions.
- Includes built-in redundancy: partition tables are stored at both the start and end of the drive, reducing data loss risk if one copy becomes corrupted.
- Required for modern EFI/UEFI firmware on newer computers.
Common gotchas:
- Older computers with BIOS firmware cannot boot from GPT drives without workarounds like Compatibility Support Module (CSM).
- Some legacy software expects MBR partitioning and may fail with GPT disks.
- Partition recovery tools behave differently on GPT versus MBR.
When you buy a new PC or external drive today, it almost certainly uses GPT. If you're upgrading an older system or dual-booting with legacy Windows versions, verify your firmware supports GPT before repartitioning. Modern operating systems (Windows 10+, macOS, Linux distributions) all support GPT natively, making it the practical standard for most users.