SanDisk Extreme 256 GB microSDXC Memory Card + SD Adapter with A2 App Performance + Rescue Pro Deluxe, Up to 160 MB/s, Class 10, UHS-I, U3, V30, Red/Gold

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As for the other tests, dropping the card countless times from about 1.5m onto a hard and soft surface had little if any effect. To be on the safe side, I dropped it from a height of 4m on to the patio, and the card still works fine. I would imaging that due to the small size and weight dropping the card is going to do little, especially when housed inside a drone or action camera. Class 1 (A1) Application Performance Class also called SD Physical 5.1 spec, with a write speed of 10Mbytes/sec and minimum random read of 1500 IOPS (Input/Output Operations Per Second) and random write of 500 IOPS. IOPS is used because it’s a useful way of measuring the speed of the kind of computing operations that applications undertake, as opposed to simply reading or writing a large file. After several tests, the write speed averaged around 82 mb/s and read speeds of 90mb/s. A little off on the max read speed, but the all important write speed is almost spot on.

SanDisk Extreme® microSDXC™ UHS-I CARD, 4K UHD, Full HD SanDisk Extreme® microSDXC™ UHS-I CARD, 4K UHD, Full HD

Get faster app performance for an outstanding smartphone experience thanks to the SanDisk Extreme ® micro SDXC card’s A2 Specification. Durable design for use in extreme environments

When a microSD card (or any disk system) stores a file, it might need to split it into pieces to fit around information already on the card. Over time adding and removing files can leave a number of fragments of files which will slow down accessing the card because the device needs to move between each fragment as it reads or writes. Thoroughly deletingthe device (formatting and starting again) or using a defragmentation tool is a good solution. Giving the card an extensive test over three weeks, its integrity remained intact, and there were no issues with dropped or corrupted files. SanDisk's own readers. Their maximum speed is closer to 99MB/s when used in other card readers, including older SanDisk readers. The card's A2 performance rating indicates the 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.

SanDisk Extreme® microSDXC™ UHS-I CARD, 4K UHD, Full HD SanDisk Extreme® microSDXC™ UHS-I CARD, 4K UHD, Full HD

UHS Speed Class 3 (U3) designates a performance option designed to support real-time video recording with UHS-enabled host devices. Video Speed Class 30 (V30), sustained video capture rate of 30MB/s, designates a performance option designed to support real-time video recording with UHS-enabled host devices. See www.sdcard.org/consumers/speed.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. The next generation specification, settled in June 2018, supports cards up to 128 TiB (1 Tebibyte is 1024 GB), however it is still not in regular use yet.