Micro SDXC memory cards are a derivative of SDXC Cards - eXtended Capacity micro SD cards sport the same features as the SDXC card - with a top end capacity up to 2TB (2048GB!) and read/write speeds up to 300MB a second.

With the recent arrival of SDXC cards and the introduction of a host of new compatible cameras, the new Micro SDXC format is due soon and will fuel tomorrow's feature rich mobile devices.

Micro SDXC are small in size - using the same physical dimensions as the TransFlash / micro SD card that are used in mobile phones and many small digital cameras an electronic devices where even the small size of a regular SD/SDHC card is too big. With a Micro SDHC/SDXC adapter microSDXC card can be used in a full sized SDXC card slot.

 
Kingston Micro SD card - Made in Japan Version. It has been discovered that the Kingston MicroSD card (SD-C02G/SD-C01G) Japanese version, is faster when used in some mobiles that the made in Taiwan version.

Reported Read / Write speeds vary.
- Taiwan = 7-8x speed
- Japan = 10-12x speed

As a mobile phone user you’d have to ask yourself whether x2 speed is really going to make any difference and if it is actually worth scouting around the web for the “made in Japan” Micro Sd card