Compared across 14 stores. Prices are checked against each store and labelled with when.
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The SanDisk Extreme is a 512GB microSDXC card rated A2, UHS-I, V30, U3 and Class 10, with reads up to 190 MB/s and writes up to 130 MB/s. That V30 rating guarantees a sustained 30 MB/s write, enough for 4K video in drones, action cameras and phones. The A2 rating means faster app installs and launches when the card is used as adoptable storage on Android. It ships with an SD adapter that has a write-protect switch, and SanDisk rates it for water, shock, X-ray and temperature extremes. Against cheaper U1 cards it costs more but handles 4K recording and app use that U1 cards cannot sustain.
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Lowest price we've seen: $105.99 on Nov 11 at Walmart. Tracked across 14 stores since Nov 11.
Owners of drones, action cameras and phones generally rate the Extreme card highly for reliable 4K recording and quick transfers. Some report that real-world write speeds fall short of the headline figure, and a few have had cards fail.
This is a 512GB SanDisk Extreme microSDXC memory card. It comes with a full-size SD adapter, so it can be used in devices that take either card size. It records Full HD, 3D and 4K video.
The card is rated A2, UHS-I, V30, U3 and Class 10. Maximum read speed is 190 MB/s and maximum write speed is 130 MB/s. Minimum write speed is 30 MB/s.
The card is water-proof, shock-proof and X-ray proof, and it can withstand extreme temperatures. The adapter has a built-in write-protect switch. RescuePRO recovery software is available to download.
