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SPECIFICTION
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Defraginator

github.com

WindowsmacOSLinux
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Spec score 7.3 #12 of 20 in Disk Defragmentation Software

What it is

Defraginator is a desktop utility for making selected ROM and firmware `.bin` images contiguous on removable storage. It detects mounted volumes that appear to be removable, scans them recursively, and checks matching files’ physical layout. You can enable or disable target sizes of 256 KB, 512 KB, 1024 KB, and 2048 KB; files outside those sizes are not in scope. The app needs a single free gap at least as large as the file. It reports available free space and, on Windows, the largest contiguous block; on Linux and macOS, that largest-block figure is unknown. Windows moves clusters in place and requires administrator rights. Linux and macOS rewrite files into newly allocated space and check their physical extents; the Linux FIBMAP fallback requires root, while the listed macOS operations run as a normal user. The project says it restores the original after an unsuccessful rewrite and reports success only after verifying contiguity. Keep the card connected during work. Defraginator is free and GPL-3.0 licensed; building it requires the .NET 10 SDK.

Spec sheet

Purpose
Defraginator is a desktop app that defragments split .bin ROM and firmware images on SD cards and other removable media.Read 8 Oct 2026 · github.com
License
The repository identifies its license as GPL-3.0.Read 8 Oct 2026 · github.com
Build requirement
The README lists the .NET 10 SDK as a requirement and provides instructions to build and run the app from source.Read 8 Oct 2026 · github.com
Data safety
The README says the file data remains present during defragmentation and that unsuccessful rewrites restore the original file.Read 8 Oct 2026 · github.com
Drive scanning
It detects mounted volumes that look like removable media and recursively scans them for matching files and their physical cluster layouts.Read 8 Oct 2026 · github.com
File selection
It scans for `.bin` files that match enabled target sizes of 256 KB, 512 KB, 1024 KB, or 2048 KB.Read 4 Oct 2026 · github.com
Free-space limit
A file can only be made contiguous when the drive has a single free gap at least as large as that file; Linux and macOS show the largest free block as unknown.Read 8 Oct 2026 · github.com
Linux and macOS method
On Linux and macOS, it rewrites files into freshly allocated space and checks whether each occupies one physical extent.Read 8 Oct 2026 · github.com
Linux and macOS support
On Linux and macOS, it rewrites files and verifies their physical extent layout; Linux’s FIBMAP fallback requires root, while the listed macOS operations run as a normal user.Read 4 Oct 2026 · github.com
Operating caution
Users are told not to remove the card while defragmentation is in progress.Read 4 Oct 2026 · github.com
Permissions
Windows cluster moves require administrator rights; Linux normally runs as a regular user except for the FIBMAP fallback, which requires root, and macOS runs as a regular user.Read 8 Oct 2026 · github.com
Runtime requirement
The repository lists the .NET 10 SDK as a requirement and provides build-and-run commands.Read 4 Oct 2026 · github.com
Safety
The README says the original file is restored if contiguous placement fails on Linux or macOS, and success is reported only after physical contiguity is verified.Read 4 Oct 2026 · github.com
Scope limit
The tool only touches .bin files matching a selected target size.Read 8 Oct 2026 · github.com
Space requirement
Defragmentation requires a contiguous free gap at least as large as the file; the app reports free space and, on Windows, the largest contiguous free block.Read 4 Oct 2026 · github.com
Target files
It scans .bin files exactly 256 KB, 512 KB, 1024 KB, or 2048 KB in size, with each target size independently toggleable.Read 8 Oct 2026 · github.com
Windows method
On Windows, it finds contiguous free clusters and moves file clusters in place using filesystem control operations.Read 8 Oct 2026 · github.com
Windows support
On Windows, it uses filesystem controls to find contiguous free clusters and move file clusters in place; moving clusters requires administrator rights.Read 4 Oct 2026 · github.com
Workflow
The app detects mounted removable volumes, recursively scans matching files, checks their physical cluster layout, and relocates fragmented files into contiguous free space.Read 4 Oct 2026 · github.com

Strong points and limits

Strong points

  • Free and GPL-3.0 licensed.
  • Runs on Linux, macOS, and Windows.
  • Target file sizes can be toggled independently.
  • Checks physical layout before reporting success.
  • Shows free space and Windows contiguous-block size.

Limits

  • Only selected `.bin` target sizes are handled.
  • A sufficiently large contiguous free gap is required.
  • Windows cluster moves need administrator rights.
  • The .NET 10 SDK is required to build.

Who it suits

It suits users who need to arrange supported `.bin` ROM or firmware images on removable media and can meet the platform’s permission and free-space requirements.

Verdict

Defraginator has a narrow, clearly stated job: reorganizing supported `.bin` files on removable volumes. Platform-specific permissions and the need for a large enough free gap are important constraints to check first.

Where Specifiction places it

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