Secure Digital, the format on your point-and-shoot’s memory card, has been the standard since 2000. SDXC, the newest iteration, makes those cards capable of holding far more than your vacation photos. By ditching the antiquated FAT32 file structure and relying instead on Microsoft’s exFAT architecture, SDXC is capable of holding up to two terabytes on a single card—enough to capture 20 days of HD footage. The format also supports transfer rates as high as 104 megabytes per second, foretelling the end of hard-drive-based HD camcorders, and allowing manufacturers to someday replace hard-disk boot drives with SDXC cards in future mobile computers.[http://www.popsci.com]
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