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What Does Class Mean?

When purchasing memory cards, consumers are typically faced with the challenge
of determining what class of card they need. Memory card class comes down to 2
basic components, speed and application.

The speed rate specifications for memory cards were established based on the
needs of movie and video companies. Video recording requires certain writing
speeds when recording the data onto an SD card.

Speed Class Rating is the official unit of speed measurement for SD Cards as
defined by the SD Association. The SD Association establishes specifications that
rate the minimum data transfer in SD and SDHC memory cards and host products.
Certain speeds then correlate to the applications for which a card is used. Generally,
manufacturers suggest a card type and class based on the types of files an electronic
device uses and/or creates.

Under former SD specification 2.0, the highest speed class rating was Class 6.
However, under the recently released SD specification, a new higher speed class was created (Class 10) for operation under High Speed Mode in newer devices.  The Verbatim Premium line of SDHC Cards which were rated Class 6 under the former spec are now rated Class 10 under the new spec, ensuring the highest level of performance available in the market.

 
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1MB = 1 million bytes; 1GB = 1 billion bytes; 1TB = 1 trillion bytes. Actual capacity may be less; device uses some memory for formatting and the like.

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