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→BIOS/UEFI: Windows Server 2003 came out after XP, but was still using the old NTLDR boot system. |
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== BIOS/UEFI ==
On systems with a [[BIOS]], the BIOS invokes [[Master Boot Record|MBR]] boot code from a [[hard disk drive]] at startup. The MBR boot code and the VBR boot code are OS-specific. In Microsoft Windows, the MBR boot code tries to find an [[active partition]] (the MBR is only 512 bytes), then executes the [[Volume boot record|VBR]] boot code of an active partition. The VBR boot code tries to find and execute [[NTLDR]] for Windows XP, Windows Server 2003 and earlier, or the [[Windows Boot Manager]] for Windows Vista and later, from an active partition.<ref>{{Cite web |title=Boot Sequence of Windows Multi-Boot - Multibooters.com |url=http://www.multibooters.com/guides/boot-sequence-of-mixed-windows-multiboot.html |access-date=2020-11-19 |website=www.multibooters.com}}</ref>
On systems with a [[UEFI]], the UEFI invokes <code>bootmgfw.efi</code> from an [[EFI system partition]] at startup, starting the Windows Boot Manager.
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