To clarify all of the very understandable confusion:
The "Class" rating is ONLY a rating of the cards MINIMUM write speed. In this case, the card should always write at least as fast as 10 MB/s (yes, bytes, not bits).
The other speed ratings, such as the 30 MB/s or "195x" (where 1x = 150 kB/s), indicate MAXIUMUM transfer speeds.
Write and read speeds may be different, with write speeds typically being slower. Using the write speed for classification is more useful, especially for recording video or pictures.
While its tablet world topping pixel density, Tegra 2 silicon, and fresh to death OS certainly sound awesome, we had to get our grubby mitts on one to see if it's as good as its spec sheet would have us believe.
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To clarify all of the very understandable confusion:
The "Class" rating is ONLY a rating of the cards MINIMUM write speed. In this case, the card should always write at least as fast as 10 MB/s (yes, bytes, not bits).
The other speed ratings, such as the 30 MB/s or "195x" (where 1x = 150 kB/s), indicate MAXIUMUM transfer speeds.
Write and read speeds may be different, with write speeds typically being slower. Using the write speed for classification is more useful, especially for recording video or pictures.
relevant wikipedia: http://en.wikipedia.org/wiki/Secure_Digital_card#Speeds
tl;dr, Class = min, others = max