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I was sad that the disk driver section was unfinished. How does the disk driver for a spinning disk work? Does it take into account any physical properties of the needle?

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I would assume that's the job of the disk's firmware, manage the physical disk and present a compliant interface to the OS (e.g. IDE, SCSI etc...)

I've heard certain types of schedulers can take the position of the disk head into account.

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