f3 - Utility to test for fake flash drives and cards
Fight Flash Fraud
F3 - an alternative to h2testw - http://oss.digirati.com.br/f3/
F3 is a utility to test for fake flash drives and cards. It is a Free Software alternative to h2testw. f3write will fill the unused part of a filesystem with files NNNN.fff with known content, and f3read will analyze the files to determine whether the contents are corrupted, as happens with fake flash.
Fighting flash fraud on Ebay | The authors of this blog want to elimnate flash fraud on Ebay - https://fightflashfraud.wordpress.com/