Why is the operating system software loaded from the hard drive than from the rom chip?

Question

Why is the operating system software loaded from the hard drive than from the drive chip?

I was asked this question, and I can not find the answer.

Can someone explain.

Thank.

Answer 1

The simplest answer is ease of repair and extensibility. ROM cannot be easily fixed - although with some fixed storage location and some creativity and foresight when creating the original ROM, you can fix it with some hook code.

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Answer 2

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Answer 3

I think that iOS / Android does not boot from the hard drive, so it depends.

Answer 4

Size and demand. Flash chips large enough to hold the OS that most people want / want to run are ridiculously expensive.