Hi.
Basically there are two types of SD Cards variant available in the market, they are normal SD card and SDHC card(High Capacity) card..
Mornal SD card can be detected by all the card reader, but if you have a SDHC card, it can de detected by normal card reader , you should need a special SDHC certified card reader, so you wont able to read the SDHC card from your card reader
If you have the following logo present over the card, then it states that, you have a SDHC card..
PLease leave me comments, if you need further assistance
Rnj VINODKUMAR
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