The following table summarizes the main differences between MBR and GPT partitions.
|Max. disk size
||8 x 1012 TiB
||ID with 8 bit
||GUID with 128 bit
|Partitions per disk
The GPT table is stored in the 33 sectors immediately following the MBR (LBA 1 to 33).
Additionally a backup of the GPT table is stored at the end of the disk.
To prevent an unintentional overwriting of GPT partitions by MBR partition managers
the whole disk space (except for the MBR) is marked as occupied by the so-called GPT protective partition.
Since the MBR table contains only 32 bit sector numbers the GPT protective partition is limited
to a size of 2 TiB.