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What’s more, this card comes into its own on random read/write speed tests. Here, we saw the fastest performance we’ve seen from a microSD card, reaching speeds of over 12MB/sec. Other cards from Lexar, Kingston and Samsung are catching up, but this is still the speed king for app and game performance. Given that it’s only slightly more expensive than the basic Ultima Pro, that makes it one of the top options for smartphone or Switch use. The Integral Ultima Pro might be cheap, but it’s still capable of respectable speeds. We logged its sequential read speeds at 96.1MB/sec and its sequential write speeds at 87.4MB/sec, although it came in slightly slower on our random read/write tests. When looking for a MicroSD, it is essential to buy one that is just right for its intended purpose. This means that buying a card that’s not just large enough but also fast enough and not automatically the fastest or largest one out there. There are high capacity cards like UHS-II U3 that comes with a steep price but you will not always notice the benefits it offers.
The U1 and U3 are UHS Class speeds that show the minimum write speed. U1 cards support at least 10Mbps write speed and the U3 cards will deliver at least 30MBps write speed. Note that these are minimum write speed values. It is possible for a U1 card to give a write speed greater than 10MBps, say 15MBps, as well. The Speed Class, that’s denoted numeric value within the letter ‘C’ on your microSD card also denotes the sequential write speed. UHS Speed Class on the other hand indicates the minimum write speed for microSD cards that support the UHS-I and UHS-II bus speeds. Its classes are the following; MiscroSDHC: 2GB to 32GB compatible with MicroSDHC or MicroSDXC formats, which means almost all smartphones.On top of this, most cards now have a “V” (for video) rating, going from V6 all the way to V90, indicating write speeds of 6MB/sec to 90MB/sec. You need a V30 card to shoot 4K video at speeds of 60 to 120 frames per second, while V60 is the base level for shooting 8K video at 60fps. V90 is theoretically capable of handling 8K video at up to 120fps. However, given that only a handful of professional-grade cameras can offer that, and that they tend to use the larger CFexpress 2.0 cards for storage, this isn’t what you might call a must-have. As a general rule, it’s always a good idea to buy specific cards for specific tasks. This way you can guarantee the best combination of speed and capacity for your hardware to give you the best possible overall performance. We test microSD cards in a high-speed USB microSD card reader, connected to a laptop via a USB 3.2 Gen 2 Type-A connection. We use a combination of the CrystalDiskMark and AS-SSD benchmarks to test both sequential read and write speeds and random read/write speeds.
MicroSD cards can be placed inside a so-called passive adapters which allows them to be used in ports which are designed for larger storage cards. Most commonly, Micro SD cards can be placed inside SD adapters. This is useful for using a single card in multiple devices as well as using Micro SD cards in SD card readers.
The best microSD cards to buy in 2023
The latest UHS-III standard is faster still, with speeds of up to 624MB/sec in both directions simultaneously, while the SD Express standard takes this up to a staggering 985MB/sec. However, neither standard seems to have taken off yet, either in terms of cards or the readers and devices to support them. Should I always buy the fastest card I can afford? Often, fast sequential speeds come at the expense of random read/write speeds, but the A2-class 1066x is an exception; it’s not as speedy as the Integral Ultima Pro Professional High-Speed card below, but it’s faster than the SanDisk Extreme Pro and Samsung Evo Plus on this count, making it a fine all-round performer. If you’re looking for a card that can run apps or cover video on your mid-range or high-end smartphone, you won’t get much better than this. As more devices incorporate the use of microSD, manufactures have consistently improved the cards, and improved the memory available massively; storage ranges from 2GB up to 1TB or more. Additionally, microSD cards have seen much improved data transfer speeds in recent years, a crucial quality as they being to hold significantly larger files. Surprisingly, it’s easy to end up falling into various traps such as terrible performance, overpaying or worst, the card not even working at all. There are two forms of memory cards, SD and microSD. SD cards are basically used in bigger devices such as video cams and digital cameras. They are also a bit larger than your average postage stamp. MicroSD on the other hand are used more in gadgets like tablets and smartphones. They are smaller than full sized SD cards. There’s also a third form, the MiniSD, but this was used widely as a transitional form factor in the mid-2000s before the popularity of MicroSD. Today MiniSD cards are rarely seen.
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