An optical scanning device and method are provided for marking an optically sensitive layer. During a first phase of a synchronization process, the client sends one or more client metadata entries to a server. A flash memory controller includes an index for converting logical addresses sent by the host computer into physical addresses associated with sectors of the flash memory device. An MMR engine receives an electronic image from a user device, performs a visual search and identifies an MMR object that is associated with the electronic image. The arm may facilitate positioning. The capacitance of one or more of the second devices is variable to establish a desired phase shift and a desired frequency band edge within a desired frequency pass band.