Memory Card Speed Ratings: Class 2 to Class 10..
Memory Cards come in different speed ratings and this needs to be considered especially when using them for HD Video recordings.
Standard Speed Classes:
Class 2 cards are designed for a minimum sustained transfer rate of 2 megabytes per second (MB/s)
Class 10 cards are designed for a minimum sustained transfer rate of 10 megabytes per second (MB/s)
Higher Speeds are also available using the newer UHS Speed Class (designed for UHS devices only)
UHS Speed Class 1 denotes a 10 MB/s minimum write speed
UHS Speed Class 3 denotes a 30 MB/s minimum write speed
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