I missed the moving blocks, so I built a real Linux disk defragmenter
Linux filesystem defragger written in Rust and Qt Quick/Kirigami - gbin/defragger
In plain words
Defragger is a graphical disk defragmentation tool for Linux, built with Rust and Qt Quick/Kirigami. It provides visual feedback on filesystem fragmentation and block reorganization, allowing users to see how files are laid out on disk. While modern Linux filesystems rarely require defragmentation, the tool is useful for creating reproducible storage layouts during testing and offers the satisfying visual experience of watching blocks reorganize themselves.
written from the facts on this page · September 2026
From the sources
A real graphical defragmenter for Linux. Occasionally useful but weirdly satisfying. After moving to Linux, 20+ years ago ... I discovered that the Windows utility I missed most was the graphical disk defragmenter. Not because modern Linux filesystems need a weekly defrag ritual. The old block map was one of those accidental interfaces that made the machine legible: you could actually watch the filesystem reorganize itself. Then recently I needed a reproducible storage layout while testing a high-throughput logger. Fragmentation and extent allocation were adding measurable variance, even on NVMe, so the nostalgia project became a real filesystem tool. Defragger shows how files, free space,…from github.com
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