hatchzip's in-place extraction and space management capabilities on FAT32 filesystems.
Raw Developer Origin & Technical Request
GitHub Issue
Oct 23, 2026
# FAT32 USB drive: extraction, space plan and resume results
## Environment
- macOS 27.0.1, Apple Silicon (arm64)
- 15.4 GB USB stick, MS-DOS FAT32, mounted through the new `fskit` driver, 6.4 GiB free
- hatchzip 0.1.2 from source, release build (correctness), debug build (crash knobs)
- Dataset: 58 files, 405.8 MB uncompressed, 61 entries. 200.7 MB ZIP (Deflate), 200.7 MB `.tar.gz` (gzip -6), 200.0 MB 7z (`-ms=8m`, multi-block), and the ZIP byte-split into two volumes (120 MB + 75 MB)
- Every file compared by SHA-256 against the source tree. Archive and side files checked for removal after each run.
## Results
| Archive | `check` says | Extract | SHA-256 | Archive removed |
|---|---|---|---|---|
| ZIP, 61 entries | needs 245.3 MB (truncates per unit, no punch) | 77.3 s | 58/58 match | yes |
| `.tar.gz`, 61 entries | prints "this drive cannot release space inside a file..." and needs 406.0 MB | 77.6 s | 58/58 match | yes |
| 7z, `-ms=8m` | needs 245.9 MB (frees block by block) | 87.4 s | 58/58 match | yes |
| Split ZIP `.001/.002` | needs 245.3 MB | 76.8 s | 58/58 match | yes, both volumes deleted, no side files left |
Throughput: about 5.3 MB/s of output on the stick (USB 2.0-class, `ioreg` reports a USB2 hub). The same ZIP on the internal APFS SSD took 0.65 s, about 119 times faster, so the stick is the bottleneck, not the extractor.
## What this confirms
- The README's claim that in-place extraction works on FAT32 (truncation only): yes, all formats extracted byte-i...
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