0 votes 0 votes A disk rotates at $7200$ RPM. It has $500$ sectors of $512$ bytes around the outer cylinder. How long does it take to read a sector? Operating System tanenbaum operating-system input-output disk descriptive + – admin asked Oct 28, 2019 admin 1.5k views answer comment Share Follow See all 0 reply Please log in or register to add a comment.
1 votes 1 votes Answer: $7200\;\text{RPM} = 60 \; \text{seconds} \\ \Rightarrow 1 \; \text{sec} = 120 \; \text{RPM}$ $\therefore 1$ rotation $= 8.33\;\text{msec}$ To get sector time, we need to divide one rotation time by $500$ $\therefore $ Sector time $ = \frac{8.33}{500} = 16.67 \mu \text{sec}$ `JEET answered Oct 29, 2019 `JEET comment Share Follow See all 0 reply Please log in or register to add a comment.