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Sonja [21]
4 years ago
6

A disk rotates at a rate of 7200 revolutions per minute. Seek operations (i.e., moving the access head to a desired track) take

on average 20 milli-seconds. Once the access head is on the appropriate track, it takes an average of one half revolution of the disk to get to the beginning of a requested sector. Each track contains 128 sectors and each sector contains 512 bytes of data. How long on average does it take to get the access head to the beginning of a randomly selected sector on a randomly selected track? Express your answer in micro-seconds (not seconds or milli-seconds).
Computers and Technology
1 answer:
Leno4ka [110]4 years ago
8 0

Answer:

24.167 micro seconds.

Explanation:

The given rotation rate = 7200 rpm = 7200 rounds per minute

Rotational latency is the average time taken for the head to reach starting of sector .

Rotational latency (in micro seconds) = (1 / (RPM / 60)) * 0.5 * 1000

(1/(7200/60))* 0.5 * 1000 = 4.167 ms

Thus, rotational latency = 4.167 ms.

Seek time = 20 ms

The average time taken for the access head to get to the beginning of randomly selected sector will be equal to the average time to first reach the random track plus the average time taken to reach random sector .

= 20 ms + 4.167  ms  = 24.167 micro seconds.

Thus, it would take 24.167 micro seconds to get the access head to the beginning of a randomly selected sector on a randomly selected track.

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2 years ago
A bike share program in Indianapolis allows customers to borrow a bike and charge them based on the length of their ride.
REY [17]

Answer:

public static double calculate_fee(int lengthofRide, String membership){

       double fee = 0.0;

       if(membership.equalsIgnoreCase("daily")){

           fee = 1.50 +(lengthofRide*20);

       }

       else if (membership.equalsIgnoreCase("annually")){

           fee = 1.0+(lengthofRide*15);

       }

       return fee;

   }

Explanation:

The solution is implemented in Java. The complete code prompting the user to enter ride duration and membership type is given below:

import java.util.Scanner;

public class num4 {

   public static void main(String[] args) {

       Scanner in = new Scanner(System.in);

       System.out.println("Enter your membership \"daily\" of \"annually\"");

       String membership = in.nextLine();

       System.out.println("Enter your ride duration in minutes");

       int rideTime = in.nextInt();

       //calling the method calculate_fee

       System.out.println("Your total fee based on your membership is "+calculate_fee(rideTime,membership));

   }

   public static double calculate_fee(int lengthofRide, String membership){

       double fee = 0.0;

       if(membership.equalsIgnoreCase("daily")){

           fee = 1.50 +(lengthofRide*20);

       }

       else if (membership.equalsIgnoreCase("annually")){

           fee = 1.0+(lengthofRide*15);

       }

       return fee;

   }

}

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3 years ago
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