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As a general rule most SD cards 2GB or less will be a standard SD card. Most cards 4GB and above will be SDHC cards. Although there are 4GB SD cards which could be either, but I have never seen a 4GB standard SD card. I have never seen a card 2GB or smaller as being a SDHC card, but I suppose that this possible.
I have purchased so many SD cards for various devices and the standard is usually as indicated above.
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