This invention generally relates to wired and wireless ultra wideband data communications apparatus and methods, and in particular to UWB receiver systems and architectures, and to training and synchronisation systems therefore. In one form, cooling channels can be coupled to or formed on the cylinder to direct the lubricant that is splashed onto the cylinder to drain in a desired manner, such as helically around the exterior of the cylinder, to more effectively cool the piston kit. To implement Virtual Network Attached Storage, the respective \u201cfree\u201d second portions of each storage medium are aggregated into a shared storage volume.