Abstract
In magnetic and optical storage systems, RLL (run length limited) modulation code is widely used. An RLL code having a limited amount of error propagation and high density ratio is attractive for high density storage system. This paper presents a new fixed-length RLL modulation code with d=4 and k=20, and code rate m/n=4/11. The code design is based on the look-ahead method. This code has finite error propagation limited to at most two codewords.
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