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The SanDisk Extreme 512GB is a UHS-I microSDXC card rated U3, Class 10 and V30, with SanDisk quoting up to 190MB/s read and up to 130MB/s write. That write speed is the point: it clears the sustained-write floor for 4K video and handles burst shooting on action cameras, drones and phones. It sits above the plain Ultra line and below the Extreme Pro, which is faster still and costs more. Buyers pick it for reliable recording in cameras and handhelds rather than for the fastest card available.
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Owners generally rate the Extreme line highly for dependable recording in action cameras, drones and the Switch, and the 512GB size is popular for long trips. Complaints center on cards that failed or arrived slow, and on the gap between quoted and real-world speeds.
The SanDisk Extreme is a 512GB microSDXC memory card from SanDisk's Extreme series.
It is Class 10 and UHS Speed Class 3 (U3).
