USB 3.0 silicon such as USB host controllers, peripheral chipsets and hubs compliant with the SuperSpeed bus have arrived in the latter half of 2009. Since then, a handful of external hard drives, flash drives, storage docks, Blu-ray optical drives, high-end notebooks, and host adapters in both PCI Express and ExpressCard have begun appearing on retail shelves. Other companies have shown their plans to roll out solid-state drives and RAID. DisplayLink also revealed plans to ship USB 3.0-compliant USB video silicons by Q4 2010.