A data storage system comprising: a plurality of vertically stacked modular housing units, each modular housing unit comprising a plurality of data storage media receiving devices; a data storage media handling device adapted to laterally displace media between the media receiving devices; a vertical...http://www.google.com.hk/patents/US6515822?utm_source=gb-gplus-share專利 US6515822 - Modular data storage system with expandable vertical lift mechanism
