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Head-to-head · Disk Benchmark Software

fio vs KDiskMark

  • Updated Oct 2026
  • Both researched from official sources
  • 6 checks side by side
Higher score fio #2 in Disk Benchmark Software 8.8/10 Free plan Free plan✓ 5 of 5 features Visit fio
KDiskMark #9 in Disk Benchmark Software 7.4/10 Free plan Free plan✓ 5 of 5 features Visit KDiskMark

fio leads on 0 checks, KDiskMark on 0, and 6 are even. Who comes out ahead on the 6 yes/no, price and count checks where we have data for both products. The editor score weighs everything else too.

Our verdict

  • Highest scorefio · 8.8/10
  • Free planboth

fio scores higher on our rubric for disk benchmark software: 8.8 against 7.4 out of 10; our editors rank them #2 and #9.

fio is the better fit for broad, rigorous cross-platform benchmarking. KDiskMark is the better fit for linux users wanting an interactive benchmark.

  • fio fits best

    Broad, rigorous cross-platform benchmarking

  • KDiskMark fits best

    Linux users wanting an interactive benchmark

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Side by side

Feature fio 8.8/10 Visit ↗ KDiskMark 7.4/10 Visit ↗
At a glance
Editor score 8.8 7.4
Ranking #2 in Disk Benchmark Software #9 in Disk Benchmark Software
Best for Broad, rigorous cross-platform benchmarking Linux users wanting an interactive benchmark
Pricing model Free Free
Starting price Free plan Free plan
Free plan ✓ ✓
Free trial — —
Deployment Self-hosted Desktop
Platforms Linux, Windows, macOS Linux
Built for Solo, Small business, Mid-market, Enterprise Solo, Small business
Features fio 5/5 · KDiskMark 5/5
Random I/O tests ✓ ✓
Sequential tests ✓ ✓
IOPS measurement ✓ ✓
Latency measurement ✓ ✓
Command-line interface ✓ ✓
Specs
Supported platforms Linux, Solaris, AIX, HP-UX, OSX, NetBSD, OpenBSD, Windows, FreeBSD, DragonFly Linux
Our review
Pros
  • Covers sequential, random, mixed, IOPS, bandwidth, and latency workloads
  • Runs on Linux, Windows, macOS, and several Unix-like systems
  • Exports normal, terse, JSON, and JSON+ result formats
  • Configures block size, queue depth, and thread count
  • Measures sequential, random, IOPS, and latency performance
  • Offers both a Qt graphical interface and interactive TUI
Cons
  • Command-line and job-file workflows require technical familiarity
  • Results and workload behavior depend on configuration choices
  • Focused on engineering measurement rather than guided visual analysis
  • Supports Linux distributions rather than multiple operating systems
  • Focused on storage benchmarking rather than broader system tests
  • Requires familiarity with benchmark settings for detailed comparisons
Our verdict

fio is an open-source I/O tester for measuring storage and filesystem performance. It is intended for engineers and administrators who need configurable benchmarks across Linux, Windows, macOS, and several Unix-like operating systems.…

Read the review →

KDiskMark is an open-source disk benchmark application for Linux distributions. It is designed for users assessing HDD and SSD performance through configurable storage tests, with both a Qt graphical interface and an interactive terminal…

Read the review →
  1. fioDisk Benchmark Software 8.8Free plan
  2. KDiskMarkDisk Benchmark Software 7.4Free plan

Strengths and trade-offs

  • fio — where it wins

    • Covers sequential, random, mixed, IOPS, bandwidth, and latency workloads
    • Runs on Linux, Windows, macOS, and several Unix-like systems
    • Exports normal, terse, JSON, and JSON+ result formats

    Where it doesn't

    • Command-line and job-file workflows require technical familiarity
    • Results and workload behavior depend on configuration choices
    • Focused on engineering measurement rather than guided visual analysis

  • KDiskMark — where it wins

    • Configures block size, queue depth, and thread count
    • Measures sequential, random, IOPS, and latency performance
    • Offers both a Qt graphical interface and interactive TUI

    Where it doesn't

    • Supports Linux distributions rather than multiple operating systems
    • Focused on storage benchmarking rather than broader system tests
    • Requires familiarity with benchmark settings for detailed comparisons
  • fio8.8/10 · Free plan

    A free, open-source benchmark for detailed storage and filesystem performance analysis.

    Visit fioFull verdict →
  • KDiskMark7.4/10 · Free plan

    A configurable Linux disk benchmark with GUI, TUI, IOPS, latency, and report generation.

    Visit KDiskMarkFull verdict →

More comparisons

All disk benchmark software comparisons → · Full ranking →

Reviewed by iTechGuides Editors · Editorial team · Updated Oct 2026

Last updated · How we research and update