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Standard, Mini and Micro SD cards above 4Gb are compliant with a new standard called SD High capacity SDHC for short. SDHC cards will only work in devices showing the following logos, Card readers also need to have the correct logo to work with the cards. High capacity cards are not backward compatible with standard Micro SD devices.
 
High capacity cards and devices comply with the following speed class ratings wich specify a minimum sustained write speed for SDHC/miniSDHC/microSDHC cards (Class 2: 2 MB/s; Class 4: 4 MB/s; Class 6: 6 MB/s). look for the following logos to identify your card speed.
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