FAT12

Course overview

A hands-on guide to building a complete FAT12 filesystem driver in C — from reading your first sector to running code in QEMU. Write everything yourself, boot sector to cat command.

23 chapters
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The Book

FAT1223 chapters

Begin
  1. Introduction

  2. Prerequisites

  3. Part I: Reading

  4. Chapter 1: Hello, Disk!

  5. Chapter 2: Mounting the Filesystem

  6. Chapter 3: Listing the Root Directory

  7. Chapter 4: Reading Files

  8. Chapter 5: Reading Multi-Cluster Files

  9. Chapter 6: Full Path Walking

  10. Part II: Writing

  11. Chapter 7: Deleting

  12. Chapter 8: Moving (and Renaming)

  13. Chapter 9: Creating Directories

  14. Chapter 10: Writing Files

  15. Part III: Advanced

  16. Chapter 11: Formatting

  17. Chapter 12: Running FAT12 Inside a Kernel

  18. Conclusion

  19. Appendixes

  20. Appendix A: Talking to a Real Disk

  21. Appendix B: A First Look at Long Filename Support (LFN / VFAT)

  22. Appendix C: The Boot Sector Fields We Skipped

  23. Appendix D: FAT12 vs. FAT16 vs. FAT32