It&#x27;s not faulty; I&#x27;ve tried with a couple super-cheap&#x2F;no-name cards, and they&#x27;re all insanely slow (even a few class 6 or class 10 cards).<p>Reading up on the flash industry, it looks like most manufacturers use flash from one or two main producers, and each smaller company uses the discarded&#x2F;slower&#x2F;cheapest parts, resulting in worse performance and reliability in the lowest rungs of the scale.<p>[Edit: I&#x27;ve also updated the numbers in the post]