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Is disk arm position random when arriving a certain sector?

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I'm trying to calculate average rotational latency for disk scheduling algorithm evaluation.

I assumed that a disk with a sector size of 512 bytes, 2000 tracks per surface, 50 sectors per track and the disk platters rotate at 5400 rpm.

I know that the maximum rotational latency is 11ms ( 1 / 5400 ) * 60.But I can't know the latency in specific requests in simulation. If I know disk arm's position, I can, but I can't predict its position.

Can I assume disk arm position random when arriving a certain sector? Or is there any other method?

Thank you in advance for any help.


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