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NIELIT 2016 MAR Scientist C - Section C: 26

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Access time = seek time + rotational latency

if rotational latency is not given we take rotational latency as half the rotation time.

Given, 30 rotation in 1 second => 1 rotation in 1/30 second

so rotational latency = (1/30)*(1/2) = 1/60 second = 1000/60 ms = 16.67 ms

seek time = 30 ms

access time = 30 + 16.67 = 46.67 = 47 ms approximately,

Option (D) is the answer.
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