Please do not buy. They technically work in the sense that data can be copied and read from them, but their write speeds are around 600 KB/s. In other words, they're almost as fast as that crappy DSL line you paid for in 2004. I may have had a few bad ones, but I bought 20 and only one was able to write data at speeds over 10MB/s. I only have to fill them out and distribute them once, so technically they're not useless, but at the speed I'm getting, it takes about 3 hours to fill one out.
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