(1,7;2,3)RLL Recording code is used in many actual storage devices because of large window margin and high-density ratio parameters. Error propagation and Synchronous/Resynchronous characteristics are very important factors for the reliability of these storage devices. This paper describes the new (1,7;2,3)RLL code algorithm, hardware constitution, Sync/Re-Sync property and error propagation characteristics. The computer simulation between this code and well known another (1,7;2,3)RLL codes indicate that the Error propagation is the least level in the case of using this code.