Even some recent cameras that offer two SD card slots still only offer one that takes advantage of UHS-II. It also uses a new architecture based on the PCIe Gen3 and NVMe controllers in larger devices, which may mean it will be a while before cameras and other small capture devices can take advantage of it. It's backwardly compatible with any reader that can take those cards. The new card specification is based on the UHS-II/III SD card design - the one with the extra row of connectors. That, in theory, puts SD in a better position to use high-bandwidth file types such as 4K and 8K video, as well as for expansion in small devices.Īll of which means that the SDA's incomprehensible matrix of SD's "consumer-friendly" labeling now looks like this:Īnd these are just the performance and capacity classes for nonphone devices - there's another two for phones. And the "Express" spec increases the peak transfer speed of a full-size card from 624MB per second to 985MB per second. The new "UC" spec extends the maximum capacity of either a full-size or micro SD card from 2TB to 128TB. Good news: The SD Association has added yet another confusing specification layer to SD cards.
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