SD memory cards are the format of choice for mobile devices, but as megapixels continue to rise and HD video recording becomes the norm, flash memory speeds will become an increasingly important bottleneck. SDHC cards are cutting it for now, but according to CNET the SD Card association isn’t resting on its laurels and is hard at work on the next generation of flash designs.
Modern high-speed SD cards have data-transfer buses with a maximum theoretical speed of about 104MB per second, but in reality most cards are yielding speeds much slower than this. The new standard called SD 4.0 will increase the theoretical maximum speed to 300MB per second, and the association believes this will give them the headroom they need to build faster cards. The higher speeds are accomplished by adding an additional set of pins to the bottom face of the card, but the dimensions and backwards compatibility will be maintained.
Source:
http://www.maximumpc.com/article/home/next_generation_sd_card_standard_should_triple_speeds_2012
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