Aiming at the realization of an optical data storage system with a large disc capacity and a high transfer rate suitable for digital data archiving, we have defined the specifications of an angular-multiplexing holographic data storage system with a disc capacity of 2 TB and a transfer rate of 1 Gbps on the basis of a run-length-limited (RLL) high-density recording method using RLL modulation. To realize the specifications, RLL turbo coding, a servo system for the reference beam angle, and a servo system for book tracking were newly invented. Also, to satisfy the specifications, a holographic disc and several key components were developed in cooperation with several specialty companies. Eventually, we confirmed a high-density recording of 2.4 Tbit/in.2 achieved by the RLL high-density recording method, using evaluation equipment complying with the specifications for single book recording.
Recently, various communication tools are proposed, and it has been used a lot of people. Like this communication tools are needed writing skills. It produces factors that are to drop out of the use of communication tools that can be asked to writing skills. This study propose a mobile communication tool with intuitive pictograms.
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