SCAN Disk Scheduling Algorithm C Program

By | October 15, 2017

Let us learn how to implement SCAN disk scheduling algorithm in C programming with its explanation, output, advantages, disadvantages and much more.

What Is Scan Disk Scheduling Algorithm?

The SCAN algorithm is a disk scheduling algorithm that helps in determining the motion of a disk’s arm and head in executing the read and write requests.

In the SCAN scheduling algorithm, the disk arm moves in a single direction and executes all the jobs coming in its way.

Once the disk arm reaches the end of that direction, it reverses the direction of scanning and executes all of the jobs arriving in its path.

The SCAN scheduling algorithm is also commonly known as Elevator algorithm, and this algorithm has a very high throughput. It also reduces the response time variance compared to the SSTF algorithm.

The elevator algorithm is performed by moving the read/write head back-and-forth to the innermost and outermost track.

There are multiple enhancements performed on the elevator algorithm which is depicted by the following algorithms:

  • Circular SCAN algorithm
  • LOOK algorithm
  • Circular LOOK algorithm


  • Lower response time variance
  • High throughput
  • Average response time


  • There are chances of starvation of processes in some scenarios.

Note: This SCAN disk program in C is compiled with GNU GCC compiler using CodeLite IDE on Microsoft Windows 10 operating system.

C Program For SCAN Disk Scheduling Algorithm


Scan Disk Scheduling Algorithm in C Programming

If you have any doubts about the implementation of SCAN disk scheduling C program, let us know about it in the comment section. Find more about it on Wikipedia.

FCFS Algorithm
Circular SCAN Scheduling Algorithm
Shortest Seek Time First Scheduling Algorithm
Preemptive Shortest Job First Algorithm
Round Robin Algorithm
Shortest Job First Algorithm
Multi-Level Feedback Queue Algorithm
Preemptive Priority Algorithm
Priority Scheduling Algorithm

3 thoughts on “SCAN Disk Scheduling Algorithm C Program

  1. Manthan Patel

    Thank you so much for this algorithm. I see that you have a good collection of quite a lot of CPU scheduling algorithms.

  2. Pablo Narvaja

    I see this is like a simulation of a hard disk how can a do this if posible on an actual hardrive having windows10 or debian?


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