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01 ·OS & Runtime·★ MEMBER·9 min read File Systems from Scratch — What Does "Saved" Actually Guarantee? If the power dies half a second after your editor says "Saved," is the file still there? Starting from a library card catalogue, this builds up blocks, inodes, directories, journaling and fsync from zero — and ends with why databases refuse to trust the file system, and which knobs turn a quiet setting into a production incident.