How to Check SSD Speed in Windows 11

When boots take longer than expected, file copies crawl, and doubts arise regarding whether an expensive SSD is delivering the advertised performance, users need reliable diagnostic methods. While Windows 11 lacks a single dedicated “speed test” button, three distinct approaches allow users to check SSD speed effectively: a quick inspection via Task Manager, a command-line utility called winsat, or a comprehensive benchmark using CrystalDiskMark.

Task Manager: Instant Sanity Check

This approach provides the fastest method to observe current drive activity without requiring any setup or installation. Because it displays live, real-world disk operations instead of isolated benchmark figures, users should treat it as a preliminary sanity check rather than a definitive performance verdict.

Pressing Ctrl + Shift + Esc opens Task Manager directly, or users can right-click the Start button and select Task Manager from the menu. Navigating to the Performance tab in the left sidebar reveals system metrics; users utilizing a compact view must click More details first. Selecting the appropriate disk entry for the solid-state drive in the left column—labeled similarly to Disk 0 (C:)—displays live graphs tracking Active time, Read speed, and Write speed.

To test these metrics further, users can copy a large file, such as a multi-gigabyte video file, between folders on the same drive or from an external location onto the SSD. Observing the Read speed and Write speed values in the top-right graph corner during the transfer provides practical insight. Performance figures naturally fluctuate throughout the copy process, so users should focus on the sustained peak during transfer rather than initial or final second spikes.

If sustained numbers remain significantly below the rated specification during a large file transfer, proceeding to winsat or CrystalDiskMark allows for controlled verification.

winsat: The Hidden Built-in Utility

The winsat utility is a built-in benchmarking tool included with Windows that many users remain unaware of. It delivers quick numeric read and write results without requiring any third-party software installation, positioning it as an effective intermediate step between Task Manager and comprehensive benchmarking software.

Users can open the utility by pressing the Windows key, typing Command Prompt, right-clicking the result, and selecting Run as administrator, followed by clicking Yes on the User Account Control prompt. Executing the specific command requires typing

winsat disk -drive c

and pressing Enter, replacing ‘c’ with the appropriate drive letter if testing an alternative disk. Completion typically takes under a minute, after which users examine the output lines labeled Disk Random 16.0 Read, Disk Sequential 64.0 Read, and Disk Sequential 64.0 Write, reported in MB/s.

Because of how operations are queued, winsat figures often yield lower results compared to the sequential outcomes generated by CrystalDiskMark. Consequently, users should rely on it as a rough estimate rather than a direct specification sheet comparison.

CrystalDiskMark: Comprehensive Benchmarking

CrystalDiskMark stands as one of the most widely adopted utilities for evaluating real-time performance against manufacturer specifications, offering a free and straightforward setup process.

Downloading the software requires visiting the official download page at https://crystalmark.info/en/download/ to select an edition, noting that Standard, Aoi, and Shizuku editions are functionally identical and differ only visually. Users can select the Installer for a standard setup with a Start menu entry or opt for the ZIP archive for a portable execution format. Running the installer or extracting the ZIP folder allows immediate access to the application executable, though users must strictly download from the official site to avoid unwanted third-party bundles.

Upon opening CrystalDiskMark, users configure the run count, default set to 5 for a reliable average, and test size, where 1 GiB suffices for standard checks while 4 GiB or higher suits stress-testing sustained performance. Selecting the correct drive from the dropdown menu ensures the SSD is targeted rather than an external or secondary drive. Initiating the test via the All button executes full sequential and random read and write evaluations, which require minimal background activity to prevent skewed results.

Analyzing the results grid reveals performance metrics, where the SEQ1M Q8T1 row indicates large-file sequential speed for comparison against advertised maximums, and the RND4K Q1T1 row displays small-file random speed tied directly to application launches and boot durations.

Comparing Your Results Against Rated Specs

Evaluating sequential performance involves comparing outcomes against standard interface benchmarks outlined below:

Results falling within approximately 10 to 15 percent of the rated specification indicate healthy drive operation, accounting for normal variance from background processes, driver overhead, and testing conditions. Deficits reaching 40 to 50 percent or higher suggest underlying hardware or configuration bottlenecks limiting the drive.

Identifying the drive interface prior to comparison involves checking Device Manager under Disk drives or reviewing drive properties. Testing requirements dictate specific environmental parameters:

Troubleshooting Performance and Diagnostic Issues

Sub-par performance stems from several frequent causes, including storage controllers operating in legacy IDE or RAID modes instead of AHCI or NVMe. Additional factors include loose or sub-specification SATA cables and ports, NVMe drives negotiating lower generation speeds or reduced PCIe lanes, thermal throttling under sustained workloads, or operating capacities exceeding 85 to 90 percent.

Resolving these issues involves verifying controller modes within Device Manager under Storage controllers, inspecting physical connections, and monitoring PCIe link widths via motherboard software. Thermal throttling can be diagnosed by checking drive temperatures after intensive workloads, while freeing disk space restores performance for drives lacking adequate spare area. Users encountering administrative errors with winsat must confirm the Command Prompt was launched with elevated privileges. Similarly, security software flagging CrystalDiskMark behavior requires verifying the download origin before adjusting antivirus allowances.

Because performance metrics vary across individual test runs due to background updates, indexing, or security scans, users should execute multiple tests before concluding that an SSD is failing. Task Manager offers an immediate assessment, whereas CrystalDiskMark delivers definitive benchmark metrics for manufacturer warranty claims or specification comparisons. If persistent verification confirms performance remains severely degraded despite optimized configurations, the storage device may be failing, necessitating immediate data backups and hardware replacement planning.

Testing Method Summary

Different diagnostic approaches serve distinct user requirements when checking SSD speed in Windows 11: