# CrystalDiskMark

- **Name:** CrystalDiskMark
- **Full title:** CrystalDiskMark: One-Click SSD & Disk Speed Benchmark
- **Version:** 9.0.3
- **Developer:** Crystal Dew World (Open Source)
- **License:** Open Source
- **Platform:** Windows
- **Requires:** Windows 10 / 11
- **File type:** EXE Installer
- **Size:** 4.3 MB
- **Category:** System & Utilities
- **Updated:** 2026-10-16
- **SHA-256:** 1a255154e116a533f86535bc362f101e32d6171604cde9b6b554335856917e5e
- **Canonical page:** https://filecobra.com/app/crystaldiskmark-disk-benchmark-pc/
- **Download page:** https://filecobra.com/download/crystaldiskmark-disk-benchmark-pc/
- **Direct download:** https://sourceforge.net/projects/crystaldiskmark/files/9.0.3/CrystalDiskMark9_0_3.exe/download

> CrystalDiskMark is a small, opensource disk benchmark for Windows that measures sequential and random read/write speeds through a simple oneclick interface. Built on Microsoft's DiskSpd engine, it is the standard quick…

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.

## Installation

1. **Download the installer** — Download CrystalDiskMark from the official vendor link on this page.
2. **Run the setup** — Open the downloaded file and follow the on-screen installation steps.
3. **Launch the app** — Start CrystalDiskMark from the Start menu or desktop shortcut.

## Editorial verdict

The default test finishes in under a minute and produces the four numbers the entire storage world speaks — sequential and 4K random read/write — which is exactly why every SSD review quotes CrystalDiskMark figures. Our NVMe drive scored within 3% of the manufacturer's sequential claim and the random 4K result correctly predicted its snappy OS feel. Adjustable test size, queue depth, thread count, and fill patterns (random, zeros, ones) let you mimic anything from game loading to database workloads, and the portable ZIP runs straight from a USB stick.

The UI labels (SEQ1M Q8T1 and friends) are jargon to non-technical users — a plain-language mode would help. A single short run cannot reveal sustained-write slowdowns once an SSD's cache fills, or thermal throttling on long copies, so treat it as a snapshot, not the whole story. The themed Shizuku and Aoi editions cost $9.99 in the Microsoft Store while the standard build is completely free. For quick, comparable drive numbers, nothing beats it. We ran the default profile on three drives — a SATA SSD, an NVMe Gen4 stick, and a USB flash drive — and the ranking matched real-world copy tests exactly. Switching the test data pattern from random to zeros exposed one drive's compression shortcut, a genuinely useful diagnostic.

### Strengths

- The default test finishes in under a minute and its four headline numbers are the lingua franca of SSD reviews worldwide. Reviewers, forums, and shoppers all quote these numbers, so comparing drives before buying is straightforward.
- Adjustable test size, queue depth, thread count, and fill patterns (random, zeros, ones) mimic workloads from game loading to databases.
- Our NVMe drive scored within 3% of the manufacturer's sequential claim, confirming results track real hardware capability.
- The official portable ZIP runs from a USB stick with no installation.
- Tiny ~6 MB download and fully open source under the MIT license. The whole package is smaller than a single smartphone photo.

### Trade-offs

- Queue/thread labels like 'Q8T1' are unexplained jargon for non-technical users.
- A single short run cannot reveal sustained-write slowdowns after the SSD cache fills or thermal throttling.
- It measures speed only — drive health needs a companion tool like CrystalDiskInfo.

## FAQ

**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.

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Source: https://filecobra.com/app/crystaldiskmark-disk-benchmark-pc/ · Mirrored from the publisher's own release channel by FileCobra. FileCobra runs no antivirus lab of its own.