GPT data structures are stored in the first sectors of the drive with a secondary copy stored at the end of the drive.
GUID partition tables support up to 512 partitions. This section contains a technical overview of GPT technology. GUID partition tables support disks that are larger than 2TiB in size. On modern systems, especially systems with hardware RAID logical volumes, it is very easy to go beyond the 2TiB limit.
Why? Because the standard MBR-based partitioning scheme only supports system disks that are less than 2TiB in size. While you are probably not using an Itanium architecture computer, and you are likely using a BIOS-based rather than an EFI-based system, you still may want to use GPT partitioning. GPT, which stands for GUID Partition Table, is a disk partitioning scheme that was introduced by Intel for Itanium architecture systems, as part of EFI, the Extensible Firmware Interface.
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