Apparatus for data storage; Computer data storage apparatus; Computer databases; Computer installations for the communication and processing of data; Computer installations for the storage of data; Data handling apparatus; Data handling installations; Data networks; Data processing apparatus, systems and equipment; Data storage apparatus for computers; Data storage devices; Data storage installations; Data transmission apparatus; Data transmission installations and networks; Apparatus for linking computers and linking computers into networks; Cabinets adapted to hold computers; Computer hardware; Computer installations; Computer installations (networks); Fibre optics communications installations for use with computers; Racks and mountings for computer and telecommunications equipment