SDHC speed class confusion

5 pts.
Tags:
SD cards
SD High Capacity cards
SDHC card speed ratings
SDHC cards
Secure Digital High Capacity cards
SDHC cards have 3 speed classifications; classes 2, 4 and 6 which correspond to write speeds of 2 4 and 6 Mb/sec. Why then are some SDHC cards rated as class 4 (or even 2) with write speeds greater than 6 Mb/sec. For example, Sandisc has class 4 cards with 15 Mb/sec rates called class 4 cards.

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