Seagate fulfilled one of its CES promises on Tuesday and shipped the GoFlex Slim. The 320GB disk earns its name from an extremely minimalist shell that leads to a 9mm (0.35in) height about as thick as a pencil. In spite of the size, speed is a major factor and is helped along by a 7,200RPM spin speed and out-of-the-box USB 3.0 support, the combination of which can transfer at up to 40MB per second.