A linked information system employing evolutionary media content links is provided. Rather than require local network analysis tool resources, the disclosed embodiments identify subsets of packet traffic of interest, and these subsets are forwarded to a cloud-based server system where cloud-based virtual machine tool platforms are used to process the subsets of traffic of interest. A separation between the first level and the second level determines a phase depth condition. An actuator controls the position of the objective lens so that the laser beam is focused on a surface of the disc.