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BIOS vs UEFI: What Actually Changed
What BIOS’s real limitations were, and what UEFI’s GPT partitioning, Secure Boot, and modern execution environment actually add over it.
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From DOS to Windows 11: A Short History of the Windows Boot Process
Tracing the Windows boot process from MS-DOS’s MBR and AUTOEXEC.BAT through NTLDR to today’s UEFI and BOOTMGR chain.