H2testw for Windows

A free utility for testing storage device integrity

H2testw, developed by Harald Bögeholz, is a free utility that is designed to verify data integrity on storage devices such as USB drives, SD cards, SSDs, and HDDs. The software’s primary function is to detect data corruption and confirm actual storage capacity by writing and then reading test data on the target device. Its simple and effective testing approach helps users verify the authenticity and reliability of both new and used storage media, making it a practical tool for ensuring data accuracy.

H2testw works by writing test files with known data patterns to the selected storage device and then reading them back to check for mismatches or corruption. Users can choose the target drive and specify whether to test the entire available capacity or a portion of it. During the process, the program reports write and read speeds and highlights any data errors or discrepancies in reported capacity. This verification method is effective for identifying counterfeit or faulty storage devices that falsely advertise more capacity than they can actually store.

Data verification through write and read testing

Interface and platform support

H2testw features a straightforward graphical interface that allows users to select the target drive and choose between “Write + Verify” or “Verify” only modes. During testing, it displays progress information, including the amount of data tested, read and write speeds, and any detected errors. The software is designed exclusively for Windows and runs as a portable executable, meaning it does not require installation.

Stable performance and limited configuration

H2testw’s testing speed largely depends on the capacity and performance of the storage device being examined. Larger or slower drives naturally take longer to complete a full verification process, but the program remains lightweight and generally reliable during extended operations.

However, the software does not include advanced diagnostic tools, such as SMART monitoring or firmware data retrieval, focusing instead on simple read-and-write verification. In addition, it lacks automated reporting and detailed logging features, which limits its practicality for large-scale or professional testing scenarios. Overall, H2testw provides consistent and efficient operation for straightforward integrity checks, but its simplicity comes at the cost of advanced functionality.

Reliable verification tool for authentic storage performance

H2testw offers a reliable way to detect faulty or counterfeit storage devices using its write-and-verify testing method. It is praised for its portable, no-install design and clear error reporting. However, it lacks advanced feature sets, cross-platform support, and detailed device diagnostics. Users who need a dependable tool for verifying storage integrity on Windows will find H2testw effective and trustworthy, while those requiring more comprehensive or multi-platform solutions may prefer other utilities.