Question: When booting Linux (or most other operating systems for that matter), the bootstrap loader in sector 0 of the disk first loads a boot program

When booting Linux (or most other operating systems for that matter), the bootstrap loader in sector 0 of the disk first loads a boot program which then loads the operating system. Why is this extra step necessary? Surely it would be simpler to have the bootstrap loader in sector 0 just load the operating system directly.

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