IT Services Circle
Oct 3, 2024 · Fundamentals
How an Operating System Starts: From Power‑On to the Boot Loader
This article explains how a computer powers on, the CPU fetches initial instructions from firmware such as BIOS or UEFI, performs hardware checks, reads the MBR, runs first‑stage and second‑stage boot loaders, and finally loads the operating system kernel into memory.
BIOSOS bootboot loader
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