Promise is racing to create the fastest—and most expensive—external solid state drives around. The Pegasus J2 SSD Thunderbolt Storage Solution combines two costly technologies—SSD storage and Thunderbolt connectivity—into a palm-sized package. Retailing in Apple Stores at $799 for 256GB or an astoundingly high $1,499 for 512GB, the drive does have some impressive features that aren’t immediately obvious.
