Estimate the average time (in msms) to access a sector on the following disk:

Parameter Value

Rotational rate 15,000 RPMRPM

Tavg seek 4 ms

Average number of sectors/track 800

The average time to access a Sector on the disk is 6.005 ms

Explanation:

Rotational rate = 15000 RPM = (60/15000) = 4 × 10⁻³ s

Rotation time = 1/2 × Rotational rate = 1/2 × 4 × 10⁻³ = 2 × 10⁻³ s

Rotation time =  2 × 10⁻³ × 1000 ms = 2 ms

Transfer time = Rotational rate x (1/Average number of sectors/track)

                       = 4 × 10⁻³ x 1/800 = 5 × 10⁻⁶

Transfer time = 5 × 10⁻⁶ × 1000 ms = 0.005 ms

 Average time to access a Sector on the disk  = Average seek time + Rotation time + transfer time

Average time to access a Sector on the disk = 4ms + 2ms + 0.005 ms = 6.005 ms

The average time to access a Sector on the disk is 6.005 ms

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