These improvements should allow consumer devices using SDXC cards to store up to 100 high definition movies, 480 hours of high definition recordings, 136,000 large photographs, and many thousands of songs or audio books. The increased read/write speeds should also allow improved frame rates in digital cameras and allow consumers to shoot professional quality video on their home equipment. According to the SD Association, the speed of an SDXC card will not decrease as the memory capacity increases, as is often the case with current memory cards.
The formal specification for SDXC was released on January 7th 2009. Support for the higher capacity and speeds will also be integrated into other SD-related specifications including the SDHC, SDIO, and embedded SD specifications, although no timetable is available for these modifications. Cards and devices supporting the new format will lag the specification release by a minimum of several months (some estimations predict SDXC supported cards and devices will begin to appear near the end of 2009 or early in 2010). The SD Association expects the first SDXC cards to be 64GB with larger cards to follow later on.