Bought this pack of flash drives and have already thrown out two. They will not download any data within a reasonable time and will not delete any data requested to delete files. The first one just became gibberish the first time I used it. It looked like a cosmic alien language was streaming across the screen. I only upload a few hundred MB each week and it can take 20 minutes to insert and even more to delete (I haven't had that long with other flash drives I've had). You get what you pay for, and these flash drives cost nothing. I would recommend buying brands you know and trust even if they cost more. It makes no sense to spend good money on cheap products and then throw them away after one use.
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