The varying bus types, speed classes, and specification standards for SD cards can be confusing for the layman to navigate, but performance for the diminutive storage devices has been making a lot of progress over recent years. You can even buy one with over 500GB of capacity in a package smaller than a postage stamp, and now the SD Association is setting its sights on even bigger and faster cards with the new SD Express and SD Ultra Capacity standards as part of the SD 7.0 spec.

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