CrystalDiskMark v9.0.3 - One-Click SSD & Disk Speed Benchmark
CrystalDiskMark is a small, opensource disk benchmark for Windows that measures sequential and random read/write speeds through a simple oneclick interface.
Technical Specifications & System Requirements
Software notes
About & Overview: CrystalDiskMark: One-Click SSD & Disk Speed Benchmark
CrystalDiskMark is a small, open-source disk benchmark for Windows that measures sequential and random read/write speeds through a simple one-click interface. Built on Microsoft's DiskSpd engine, it is the standard quick test for comparing SSDs, NVMe drives, and USB storage — run it, read the four headline numbers, and you have results directly comparable with reviews and forums worldwide.
How to Install & Verify CrystalDiskMark
Download CrystalDiskMark from the official vendor link on this page.
Open the downloaded file and follow the on-screen installation steps.
Start CrystalDiskMark from the Start menu or desktop shortcut.
Frequently Asked Questions & Verification Guide
Is CrystalDiskMark free?
Yes — it is open source under the MIT license. (Themed Shizuku/Aoi editions in the Microsoft Store cost $9.99, but the standard benchmark is identical and free.)
What do the CrystalDiskMark numbers mean?
SEQ measures large sequential transfers (big file copies); RND4K measures small random operations, which matters most for how snappy Windows feels. Higher MB/s is better in both.
Why are my speeds lower than the advertised specs?
Advertised figures use ideal conditions. Your test settings, how full the drive is, background activity, and drive temperature all change the result — compare like-for-like settings.
Is there a portable version?
Yes, the official ZIP package runs without installation.