<P> With early SD cards , a few card manufacturers specified the speed as a `` times '' ( `` × '' ) rating , which compared the average speed of reading data to that of the original CD - ROM drive . This was superseded by the Speed Class Rating , which guarantees a minimum rate at which data can be written to the card . </P>
<P> With early SD cards , a few card manufacturers specified the speed as a `` times '' ( `` × '' ) rating , which compared the average speed of reading data to that of the original CD - ROM drive . This was superseded by the Speed Class Rating , which guarantees a minimum rate at which data can be written to the card . </P>
what does the class on a sd card mean
what does the class on a sd card mean
a minimum rate at which data can be written to the card
a minimum rate at which data can be written to the card