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Cake day: June 4th, 2025

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  • Well it’s a program that turns a huge array of bytes into a directory tree by allocating some of these bytes for data structures holding directory structure, metadata etc. The simplest to understand example would be FAT16 or floppy formats from 80s home computers. These had a lot of shortcomings, which were solved by more and more complex data structures.

    You can write a Python script that reads /dev/sda byte by byte and displays the directory tree. That would be a simple file system driver.