There's also 'h2testw', a simple (portable) windows executable, originally from a German magazine. But yeah, there's plenty of fake high-capacity SD and SSD at

There's also 'h2testw', a simple (portable) windows executable, originally from a German magazine. But yeah, there's plenty of fake high-capacity SD and SSD at suspiciously low prices. What gets confusing is that you can also buy mid-performance real 32 or 64 GB SD cards for as cheap as 2 bucks. Perfectly good for occasional cam or tablet use, after testing.