Random speed: A microSD card used for operating systems, applications, or games needs to be fast at reading and writing small bits of data in random locations.
Sequential writes are important for shooting video and high-resolution photos, and copying media to the card. They’re important for watching movies, loading game levels, or copying data from the card to your computer.
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You won’t get the full speed of UHS-II unless both device and card have support, because it requires an additional row of physical pins to achieve its extra speed. You should get a UHS-I bus card, unless the device you’re using specifies that it supports UHS-II.
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Class 10 or U1-rated cards can write sequential data at least 10 MB/s-the bare minimum for shooting 1080p video. Unless your device specifically requires a lower speed class (such as Class 2, 4, or 6), you should look for a card rated U1 or U3. Speed rating: The SD Association has three overlapping speed rating systems.
Check your device to make sure it supports SDXC (eXtended Capacity) cards before buying one. Capacity: You can get a good 128 GB microSD card for less than $40 most are cheaper per gigabyte than their 32 GB, 64 GB, and 256 GB counterparts.While fakes are less of a problem than in the past, it’s still necessary to watch for them, as fake cards may not have the same advertised capacity, can be much slower, and aren’t warrantied. Availability: It’s vital that the card be available from reputable first-party sellers, like Best Buy or Amazon, and not lesser known third parties selling in their marketplaces.