Jeff is Engadget's Senior Commerce Writer, which means he spends his days composing buying guides, deal roundups, and anything else that helps you more easily figure out which tech is worth your time. He's reviewed consumer electronics for more than a decade, a stretch that includes stints at Ars Technica and Business Insider.
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These metrics can then be broken down into sequential and random performance. Sequential read and write speeds matter when you’re trying to access or save long, constant streams of data, such as opening a large video or copying a big batch of files from a PC. If you want to use a microSD card for media storage, this is particularly important. Random performance, meanwhile, is about how quickly a card can read and write small files scattered throughout the device.
The older Speed Class rating overlaps with the other two systems. It’s signified by a C symbol and goes from Class 2 to Class 10, with the number indicating minimum sequential write speed. This rating is less relevant nowadays, but you may still see a “C10” logo on some cards. It’s important to emphasize that these ratings are baselines. Most V30 cards offer significantly higher write speeds than 30 MB/s, for instance, and some A1 cards can outperform some A2 models in practice. The speeds advertised by manufacturers aren’t always 100 percent accurate, either: Sometimes the card will be slower in real-world use, other times it may actually be a bit faster.The other spec to note is the card’s bus interface.
The main reason the Pro Plus tops our list is because it delivers those strong speeds at a relatively affordable price. The card originally started at $19 for, but past sales have brought those models as low as $11, $18 and $29, respectively. When it’s that cheap, the Pro Plus makes most competing microSD cards redundant. Samsung also sells the cardthat should be just as fast, though that one is currently much more expensive at $110. Either way, the card comes with a 10-year limited warranty.
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