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Simply so, is u3 the same as v30?

No, V30 is basically the same as U3, it mark the minimun waranted write speed for a single file. They can be the same card from diferent batches being the marked V30 the newer one.

Subsequently, question is, what does v30 mean? Introduction. The Extreme 90MB/s UHS-I U3 V30 is an update to SanDisk's popular performance-level SD memory card. This edition of the card bears the new Video Speed Class V30 designation, meaning the card can sustain at least 30MB/s continuous video recording.

Accordingly, is u3 better than class 10?

U1 and U3 cards are compatible with the UHS transfer bus used in newer devices, so you will often see a card rated with both U1 and Class 10. That means that when the card is used on a standard high-speed data bus, it will perform at Class 10 speed, but when used on a UHS bus, it will perform at U1 speed.

What does u3 mean on an SD card?

Faster SDXC memory cards will have the UHS rating, or Ultra High Speed, represented by a number inside the letter “U.” U1 means it's 10 MB/s; U3 means it's rated at 30 MB/s.