My workplace recently purchased several Ativa 8GB USB sticks from its office supplies agent and a colleague transferred some content to one to take for travelling. To his surprise, about half the files vanished when he later checked it and asked if I could have a look.
After noticing several corrupt files on it, I decided to format it and check it with H2testw and sure enough it failed the test. So I asked if there were any other of these sticks and he had two more still in their clamshell packaging. So I tested them two and the following are the results of all three:
The following is a picture I took of one:
As about 500MB of each drive is defective compared to 75+% defective with fake capacity drives, it appears they either have buggy firmware or used poor quality NAND chips.