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#메모리카드 2 posts

microSD Labels Decoded: V30, A2 and Express Are Different Axes

V30 and U3 mean the same 30MB/s floor, A2 measures IOPS rather than speed, and the EX mark is a different interface entirely. Here is what each symbol guarantees, with the required grade back-calculated from video bitrates.

Buying GuidesSep 9, 20266 min

microSD Speed Classes: How to Read U3, V30 and A2

U3 and V30 on the same card mean the same thing — 30 MB/s minimum write, written in two different standards. A 340 Mbps 4K stream needs 42.5 MB/s. Here is the class table and the bitrate math.

Buying GuidesAug 25, 20266 min

#메모리카드 | Spec Note