IntelliTechs ยท Oct 11, 2026
When you shop, ignore the big read-speed number on the front of the package and look for the rating that matches your use: V for recording video, A for running apps on a phone or tablet.
Card speed is not one number. Recording a steady stream of video is a different job from opening hundreds of tiny app files, and a card can be great at one and weak at the other.
The oldest one. It states the minimum sequential write speed. C10 guarantees at least 10MB/s. It works as a baseline and says little if you need more speed.
The Roman numeral names the bus, the "road" between card and device. It sets the speed ceiling, not the card's guaranteed performance:
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