In one embodiment, a system includes a controller and logic integrated with and/or executable by the controller. The logic is configured to read data stored as a plurality of first codeword sets on a first write section of a magnetic medium. The logic is also configured to read at least some of the data stored as one or more rewritten codeword sets on a rewrite section of the magnetic medium. A length of at least one rewritten row stored to the rewrite section of the magnetic medium is greater than: a length of another rewritten row in the same rewritten codeword set, and/or a length of at least one row in a codeword set stored to the first write section of the magnetic medium.