OSDev Wiki - File Systems
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OSDev community wiki page surveying file system formats and design for hobby operating system developers. It links to detailed pages on FAT, ext2, ISO 9660 and others, describing on-disk layouts so readers can write drivers that read and write real disk images.
More resources on File Systems
Operating Systems: Three Easy Pieces
Chapter from the free OSTEP textbook by Remzi and Andrea Arpaci-Dusseau introducing the Unix file and directory interface: open, read, write, fsync, rename, stat, hard and symbolic links, and mounting. Readers understand how programs interact with persistent storage through system calls.
xv6-riscv Source Code
MIT's xv6, a small Unix-like teaching kernel for RISC-V used in 6.1810. Its file system layer implements a buffer cache, write-ahead logging, inodes, directories, and path lookup in a few hundred readable lines of C, ideal for tracing how a real file system works.
CS162: Operating Systems and Systems Programming
UC Berkeley's upper-division operating systems course, with lectures, projects and exams covering processes and threads, synchronization, CPU scheduling, virtual memory, file systems, I/O and networking. Students build kernel features in the Pintos teaching OS and understand how operating systems work internally.
Operating Systems: Three Easy Pieces
Learn concurrency in operating systems with this course from Remzi & Andrea Arpaci-Dusseau, based on "Operating Systems: Three Easy Pieces."
osdev.org
OSDev.org is a community-driven resource and wiki for operating system development. It offers tutorials, articles, and sample code on topics like kernels, bootloaders, memory management, drivers, and other low-level OS concepts, plus forums for discussion.