CrystalDiskMark is a free disk benchmarking tool for Windows from Crystal Dew World, the same developer behind CrystalDiskInfo. It measures a drive's sequential and random read/write performance at configurable block sizes and queue depths, producing the familiar results grid used across hardware reviews to compare SSD and hard drive speeds. It's commonly used to verify that a new SSD is hitting its rated speeds, compare drives before and after a firmware update, or check whether a drive is connected at its full interface speed.
CrystalDiskMark vs. ATTO Disk Benchmark
ATTO Disk Benchmark is another long-standing Windows disk benchmarking tool, historically favored by some drive manufacturers for marketing numbers. CrystalDiskMark has become the more commonly cited benchmark in independent SSD reviews because its default test presets, covering sequential, 4K random, and various queue depths, closely mirror real-world usage patterns, making results easier to compare across different drives and reviews.
CrystalDiskMark Features
- Sequential Read/Write Tests — measures large-file transfer speeds
- Random 4K Read/Write Tests — measures performance with small, scattered file operations
- Configurable Queue Depth — tests performance under different levels of simultaneous I/O
- Adjustable Test File Size — runs benchmarks with different data sizes to test consistency
- Multiple Drive Support — benchmarks any connected drive, including USB, SATA and NVMe
- Real vs. Fake Drive Detection — can help reveal counterfeit or mislabeled storage devices with inconsistent results
- Result Export — saves benchmark results as text or copies them for sharing
How to Install CrystalDiskMark on Windows
- Download the installer or portable ZIP from the official link on this page or crystalmark.info.
- Run the installer if using that version, declining any optional bundled offers.
- Or extract the portable ZIP to run it without installing anything.
- Launch CrystalDiskMark and select the drive you want to test from the dropdown.
- Choose a test size and run the benchmark, keeping other disk-heavy programs closed for accurate results.
Is CrystalDiskMark really free?
Free. CrystalDiskMark is free to download and use, distributed by Crystal Dew World; there is no paid version, though the developer accepts optional donations.
How to download CrystalDiskMark safely
Use the request button on this page and we will email you the current link for crystalmark.info — the publisher's own website — so you receive the authentic build. We do not host, mirror, patch or repackage this software in any way.
Avoid third-party "download manager" sites offering CrystalDiskMark. They commonly wrap the genuine installer in their own bundler, which is how adware and browser hijackers get onto a machine that the user believed was clean.
Alternatives to CrystalDiskMark
Other free system utilities software worth comparing before you decide:
CrystalDiskInfo
Companion tool for monitoring drive health via S.M.A.R.T. data.
Frequently asked questions
Is CrystalDiskMark free?
Yes, it's completely free with no paid tier.
What do the Seq, 4K and Q depth labels mean?
Seq measures large sequential transfers, 4K measures small random reads/writes, and Q, or queue depth, reflects how many I/O operations are tested simultaneously, with higher queue depths better reflecting heavy multitasking workloads.
Why is my SSD slower than the advertised speed?
Advertised speeds are usually best-case sequential numbers; real results depend on the connection interface, drive fill level, thermal throttling and which specific test, sequential vs. random, you're comparing.
Can CrystalDiskMark damage my drive by writing test data?
No, benchmarking writes a small, temporary test file and is a normal, safe operation supported by the drive's standard write endurance.
Does CrystalDiskMark work with external and NVMe drives?
Yes, it can benchmark internal SATA/NVMe drives as well as external USB drives.
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