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Your own OS - Coding your own filesystem in C
Rating: 4.1 out of 5(3 ratings)
121 students

Your own OS - Coding your own filesystem in C

Part 1 of my #OSdev series where we develop an OS from scratch. In this course we design & implement our own filesystem.
Created bydr Jonas Birch, C programming ninja
Last updated 8/2026
English

What you'll learn

  • Learn how to structure and design your own operating system
  • Learn how to design your own filesystem from scratch
  • Learn how to implement your filesystem in the C language
  • Learn how to write a disk emulator

Course content

6 sections • 17 lectures • 20h 58m total length

  • Intro, part 117:03

    Kick off a real operating system project by building three layered components: a user-facing command prompt, an OSAPI bridging to POSIX system calls, and the bootloader and kernel.

  • Intro, part 217:50

    Learn how doctor calls emulate system calls by using EX numbers, EBX arguments, and interrupts, while building a DOS-like OS with BIOS, VGA, and a custom API.

  • Intro, part 31:58:15

    Develop core techniques for coding a filesystem in C as part 3 of the intro to your own operating system series.

Requirements

  • You need to know the basics of the C language

Description

Series: Your own OS
Course: Coding your own filesystem in C


Course description
In this exciting new project we will implement our own filesystem in C. We're going to develop a disk emulator and an OSapi which makes it possible to run this project under Windows, MacOS or Linux - no virtual machines necessary!

Our filesystem will make use of a regular file on your disk, emulating a real hard disk device - which makes all this possible during development. Then we can easily switch to a real hard disk model when we are done coding, going into production.

This course is part one of my OSdev series where we develop a fully functional, real MS-DOS like operating system, based on the Intel x86 16 bit real mode architecture.


-Why learn C from dr Jonas Birch and not from the other ten Udemy instructors?

Experience in the C language. When dr Birch was 18 years old and had been coding C for five years, he was traveling all over Europe, invited to different coding and security conferences, giving lectures about C and security. Since then he has coded C almost every day - for an additional 20 years!

Experience in teaching. Dr Birch has been teaching the C language (live) almost full time the last six years, helping hundreds and hundreds of students learn the mother of all languages - in Linux.

Very soothening voice and amazing sound quality. Dr Birch has a very dark, relaxing voice which is very easy to listen to (a really underestimated feature). He is recording in a professional recording studio with enterprise level microphone and equipment, which makes for a very good listening experience.


Enroll Now or try out the free sample lectures.

Who this course is for:

  • This course is for mid-level C programmers who want to take the next step and learn OS development.

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