![]() It also helps to get a reliable card from a reputable manufacturer like Samsung, SanDisk, or Kingston to minimize the chances of something going wrong. Although we didn’t eliminate cards for having a shorter warranty, we noted ones that offered 10-year limited and lifetime limited warranties. Warranty: The longer the warranty, the better.All our picks are UHS-I we didn't test any UHS-II cards because few devices need them, and UHS-II cards are very expensive. 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. UHS-I bus mode: Bus mode is a standard that dictates how different generations of SD cards work.V60 and V90 microSD cards, which are fast enough to record 8K video, are expensive and require relatively rare UHS-II bus devices, so we didn’t test any. Cards rated U3 or V30 have a minimum sequential write speed of 30 MB/s, enough for 4K video. ![]() 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.
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