Wikipedia has a nice list of factors and a table of compatibility, if you’d like more details.Īlso Full-size SD cards and Micro SD cards may not work in devices that are specifically designed for one or the other, even though smaller cards can fit into larger card slots via adapters (see the section below). The best example of limitation of newer cards in older devices is that your device might not be able to read the full size of the card, or read the file system of the card, or just have an older/obsolete hardware interface. CompatibilityĪs a disclaimer, most devices such as cameras, mobile phones and card readers will generally work with older SD Cards, but newer SD Cards with higher Class and Speed classifications may not work in these older devices – check your owners manual or Search online for compatibility for cards that work with your device before purchasing. Similarly with the latest Digital SLR Cameras (especially in modes such as sport, multi-frame or burst-mode) where multiple images are taken, having a faster card will allow you to review the images much sooner (less waiting for the images to write to the card). Some cheaper action cameras will buffer the recording, but this is not practical in the slower card speed classes, and may cause juddering or stuttering of the recorded footage, as well as other issues. If you have an Action Camera (Such as GoPro or EvoDX) that records HD at either 1080p or 4K you really need to be thinking about purchasing a UHS-3/III card, for the best performance and writing speed. UHS speed classes are shown on the card with a number inside a U.Ĭonfusingly, UHS Class 1 and Class 10 refer to the same 10MB/s speed, so sometimes you’ll see cards that are labelled both as Class 10 and UHS-1. UHS Class 3/III supports 4K video recording. Here we see a similar system – UHS Class 1 (or just U1 or U-I), which has a minimum performance rating of 10MB/s writing speed, while UHS Class 3 (or U3 / UHS-III) has a rating of 30MB/s. An additional standard called UHS was introduced, which allows cards to reach higher speeds. The Class rating is displayed on the card, by a number nested inside a circle.Īfter the Class 10 classification, it becomes a little more complicated.
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