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The SanDisk Extreme microSDXC is a UHS-I card rated V30, U3 and A2, aimed at action cameras, drones, phones and handheld consoles. SanDisk quotes read speeds up to 245MB/s and write speeds up to 170MB/s for the 256GB to 1TB capacities, which is fast for a UHS-I card and keeps 4K and 5K recording and app loading smooth. It sits above basic Ultra cards for sustained video writes and below the Extreme Pro line, which adds faster sequential writes and a lifetime-limited warranty. Owners rate it highly for reliability in GoPros, drones and Steam Deck-style devices, though some report cards that slow down or fail after heavy use.
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Owners generally praise the card for dependable 4K recording in action cameras and drones and for quick app loading on handheld consoles. Complaints center on cards that slow down or stop working after months of heavy use, and on write speeds that fall short of the quoted figure in some devices.
The SanDisk Extreme is a 512GB microSDXC card with a UHS-I interface. It is made for recording 5K point-of-view and 4K UHD aerial video, and for adding storage to Android devices, laptops and handheld gaming consoles. It carries U3 and V30 video speed class ratings and an A2 app performance rating, which helps apps load quickly.
The card reads at up to 245MB/s and writes at up to 170MB/s. It supports continuous burst mode and slow-motion Full HD video. It is temperature proof, humidity proof, waterproof, shock proof, drop proof, magnet proof, X-ray proof and wear-out proof.
The SanDisk desktop and Android mobile app can back up, organize and transfer photos and videos. It works with the microSD slot on a phone or with a card reader. The card is made with SanDisk's in-house NAND flash memory and proprietary Flash Management Techniques, and it comes with a lifetime limited warranty.
