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Consider these things typically work in pairs. BIOS + MBR as the old system and UEFI + GPT as the modern replacement.GPT disks contain five data structures: * the protective MBR* the main GPT header* the main partition table* the backup partition table* the backup GPT headerSee: [http://www.rodsbooks.com/gdisk/repairing.html Repairing GPT Disks] by Rod SmithSee also:* [[BIOS]]* [[CMOS]]* [[UEFI]][[Category:Computer Technology]]