MediaTester can test any media (SD, microSD, thumb drives, memory sticks, etc.) and verify it stores the expected number of bytes. The testing method is similar to h2testw but MediaTester can detect fake or defective media much faster by performing quick reads as data is written.

Download the latest MediaTester for Windows (Standalone executable - no install required)

See past releases of MediaTester

Fake media sales have reached epidemic proportions. Fake media is being falsely labeled with popular brand names including SanDisk, Samsung, Sony, Kingston, and others. Not only are these counterfeit but often contain less storage than the cards report to the computer. A 128GB SD card may actually contain only 8GB or 4GB of actual space. After filling up all of the real space, the card will respond as if it is storing the data but it is actually throwing it away. The files will look like they exist but they are actually full of null bytes or completely corrupted. If you try to read the data you will find that it is ALL GONE.

MediaTester is released as a free public service to help stop counterfeiters and fraudsters. If you buy any storage media, use MediaTester to verify it or risk losing your data.

The MediaTester library, Windows GUI, and CLI are released under GNU GPL license.

Enjoy!

-Doug Krahmer