1. A method of converting information words, comprising: receiving m-bit information words, where m is an integer; and converting the m-bit information words into n-bit code words based on a code conversion table including a plurality of coding states, where n is an integer greater than m, wherein the plurality of coding states are categorized into a first kind or a second kind and a number of coding states of the first kind is greater than a number of coding states of the second kind, wherein each coding state includes at least two code words of a same value representing information words of a different value, and wherein a minimum number of zeros between consecutive ones in the n-bit code words is 1.