It also specifies the number of partition entries of the table. The header contains the disk GUID, the location of the primary partition table, the location of the secondary GPT header, and CRC32 checksums of itself and the primary partition table. The primary GPT header begins on the second logical block ( LBA 1) of the device. To preserve backward compatibility with MBR disks, the first sector ( LBA 0) of GPT is reserved for MBR data and it is called “protective MBR”.
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