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Tech riderRev. 4 Oct 2026

e4defrag

Ch 116.4of 22 Disk Defragmentation Software
  1. 1Runs onLinux
  2. 2CostsFree plan
  3. 3Filesystem supportmulti-filesystem
3 lines stated Written from the maker's own pages: github.com
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Overview

e4defrag is ranked #11 of 22 in disk defragmentation software on Specifiction. It runs on Linux. There is a free plan.

e4defrag plans and pricing

All plans
e4defrag Free Ext4 files only · swap files, files in lost+found, and files allocated in indirect blocks are unsupported github.com · 4 Oct 2026

Compared on disk defragmentation software

Filesystem support
multi-filesystemgithub.com

Facts

Purpose
e4defrag is an online defragmenter for extent based files on ext4 filesystems.man7.org · 4 Oct 2026
Targets
It accepts a regular file, directory, or device mounted as ext4; a directory target covers its files.man7.org · 4 Oct 2026
Defragmentation
It aims to give targeted files more contiguous blocks, which the manual says improves file access speed.man7.org · 4 Oct 2026
Fragmentation check
The -c option reports current and ideal fragmentation counts and a fragmentation score without defragmenting the target.man7.org · 4 Oct 2026
Verbose output
The -v option prints error messages and each file’s fragmentation count before and after defragmentation.man7.org · 4 Oct 2026
Supported filesystem
The source checks for ext4 and reports an error when the filesystem is not ext4.github.com · 4 Oct 2026
Unsupported files
The manual says e4defrag does not support swap files, files in lost+found, or files allocated in indirect blocks.man7.org · 4 Oct 2026
Other mount points
When given a device or mount point, it does not defragment files belonging to another device’s mount point.man7.org · 4 Oct 2026
Free space
Fragmented or insufficient filesystem free space can prevent e4defrag from improving a file’s fragmentation.man7.org · 4 Oct 2026
Use while active
The manual says it is safe to run on a file while another application uses it, though shared memory and disk bandwidth can slow both.man7.org · 4 Oct 2026
Permissions
Non-privileged users can run it on their own files, but the fragmentation score is not printed for -c runs unless run as root.man7.org · 4 Oct 2026
Project
The maker’s README describes e2fsprogs as second extended filesystem management programs and says it supplies instructions for building and installing them.github.com · 4 Oct 2026
Support
The project README directs bug reports for its programs to Ted Ts’o by email.github.com · 4 Oct 2026
Authors
The e4defrag source credits Akira Fujita and Takashi Sato as authors.github.com · 4 Oct 2026

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Sources