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Actually, it's SDHC (Secure Digital/High Capacity). It's a newer format that increases the throughput (speed) and storage size (space) of the cards.

SD cards are typically found up to 2 or 4GB. SDHC go from 4 to 32GB. SDXC (Secure Digital eXtended Capacity) go up to 2TB (2,048GB).

The SDHC cards are the same as SD cards in many ways, but older devices designed for the original SD cards may not read them. Devices that support the SDXC and SDHC standards should be able to read a regular SD card as well.