A look at the most exciting gadgets of CES 2009

They have been around for the best part of a decade, but Secure Digital (SD) cards have evolved yet again.

The first evolution past the original specification was SDHC (High Capacity), which took capacities up to 32GB. However, the new SDXC (eXtended Capacity) format, announced on Wednesday, should have a maximum capacity of 2TB — larger than most of the external hard drives people use today.

The new format will, according to the SD Association industry body, be ideal for professional photographers or those who want to have 100 high-definition movies on their handset.