![]() Video Speed Class: This is shown as a V with a number after it and is commonly shown as V30 (30 MBps), V60 (60 MBps) or V90 (90 MBps).However, in practice, we’ve tested cards rated as UHS 1 that were just as fast as 3s. The 1 promises 10 MBps and the 3 offers 30 MBps. UHS Speed Class: This is the most common spec and appears as either a 1 or a 3 inside of a U symbol.The highest class, class 10, is a mere 10 MBps so any new card will meet this standard. Speed Class: The oldest class system appears with a circle around the number.The SD Association provides a detailed explanation by to keep it simple, here’s a brief list: When you’re shopping for a microSD card, whether it’s for Raspberry Pi, a phone, a camera or a Nintendo Switch, you’ll see as many as four different types of speed ratings listed, the first three of which measure minimum sequential write speed in MBps. MicroSD Speed Ratings and Types: What Do They Mean? It failed the Raspberry Pi Diagnostic test, thanks to really poor 4K random writes and overall sequential writes. This card was rated UHS 3, proving how meaningless these speed numbers are. Fatty Dove: You wouldn’t expect much of a no-name brand like Fatty Dove so you won’t be disappointed.It had the slowest app open times and also failed the Raspberry Pi Diagnostic Test. ![]() It was the slowest card to boot by far, taking more than twice as long as the fastest booting card on both the Pi 4 and Pi 3 B+, the Kingston Canvas React.
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