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The specification defines these classes in terms of performance curves which translate into the following minimum performance levels (on an empty card):[40]

Class Minimum performance

SDHC Speed Class 2.svg Class 2 2 MB/sec

SDHC Speed Class 4.svg Class 4 4 MB/sec

SDHC Speed Class 6.svg Class 6 6 MB/sec

SDHC Speed Class 10.svg Class 10 10 MB/sec

Speed Classes 2, 4, and 6 assert that the card supports the respective number of MB/sec as a minimum sustained write speed for a card in a fragmented state. Class 10 asserts that the card supports 10 MB/s as a minimum non-fragmented sequential write speed.[40] By comparison, the older "×" rating measured maximum speed under ideal conditions, and was vague as to whether this was read speed or write speed.

The host device can read a card's speed class, unlike the earlier "×" speed ratings. A device can warn the user if the card reports a speed class that falls below an application's minimum need.[