SanDisk Extreme microSDXC 256GB C10 U3 V30 A2 160MB/s 90MB/s

256GB microSDXC card for action cameras and phones

This SanDisk Extreme microSDXC card provides 256GB of removable storage in the microSD form factor. It carries Class 10, U3, V30 and A2 ratings for sustained write performance. Sequential read speed reaches 160MB/s and write speed reaches 90MB/s. The card targets users who need reliable capture of high-bitrate video and fast app loading on mobile devices.

Suits 4K video recording and app-heavy workloads

The V30 rating guarantees a minimum 30MB/s sequential write speed, making the card suitable for 4K video capture on drones, action cameras and mirrorless bodies that accept microSDXC. A2 qualification means random read and write performance is tuned for running applications directly from the card. Buyers whose devices only support the older microSDHC limit of 32GB cannot use this 256GB card. Users who require sustained write speeds above 90MB/s should look at higher-tier media.

Maintains rated write speed during long recording

Under sustained load the card is designed to hold its V30 minimum of 30MB/s sequential write without dropping to lower speed classes. The 90MB/s maximum write burst helps clear the buffer quickly between bursts of high-bitrate footage. Thermal throttling is mitigated by the card's construction for continuous operation in compact devices. Real-world throughput will vary with host controller capability and file system overhead.