Related: proving that your fake $50 16TB USB drive really is fake. Really clever malicious firmware would notice your script is writing the same 100MB over and

Related: proving that your fake $50 16TB USB drive really is fake. Really clever malicious firmware would notice your script is writing the same 100MB over and over (or the same 25K block checksums over and over), and would successfully trick your script. Different threat model, though.