Solid State hard drives are the latest in the evolution of storage technologies. They will eventually replace hard drive based storage devices currently used in your laptops and desktop computers. They are designed to save information directly on to silicon chips as opposed to magnetically encoding a rotating steel platter. One of the interesting by-products of this move is that Solid State drives can be easily and quickly erased. Older hard drives would take considerably longer to do a low-level format which would permanently erase all data. This has now allowed criminals to erase evidence instead of being caught.
See the full article on the Sydney Morning Herald