Abstract: A method for encoding data to meet a maximum run length limitation is disclosed. In one embodiment, the method comprises the steps of: (1) providing user data that includes a plurality of bits, wherein said bits have a value of 1 or 0; (2) performing an ECC computation on said plurality of user data bits to add ECC symbols in the form of a plurality of ECC bits; (3) randomizing the plurality of user data bits and said plurality of ECC bits; (4) analyzing said randomized user data bits and ECC bits to determine whether a number of consecutive bits have a common value; and, (5) inverting the value of a bit, when the number of consecutive bits having a common value exceeds the maximum run length limitation. Subsequently, representations of each of the randomized user bits and ECC bits, including any inverted bits, are stored onto a disk surface as magnetic-polarity transitions.