Secure Digital (SD) Card: A Secure Digital (SD) card is an SDMI-compliant flash memory card used in many digital cameras, memory players, and other portable digital devices. Like other SDMI-compliant cards, an SD card uses an extra chip to recognize and comply with the requirements imposed on copyright-protected materials. You'll also come across SDHC cards, a newer, high-capacity SD card format. Now, while any SDHC-compliant camera or PDA will be compatible with standard SD cards, an SD-compatible device will not necessarily work with SDHC cards. In fact, if your device is more than a year or two old, chances are it won't be SDHC-compliant. And there are quite a few newer devices that won't work with SDHC cards either. So be sure to check your owner's manual to confirm compatibility before buying an SDHC card.

 

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