(4, 20) runlength limited modulation code for highdensity storage system
M.-G. Kim, Jac Hong Lee · Electronics Letters · 1995
An RLL (run length limited) modulation code having a limited amount of error propagation and high density ratio is attractive for use in a high density storage system. The authors present a fixed-length (4, 20) RLL code with code rate m/n = 4/11. The code design is based on the look-ahead coding method.