A method for producing N-bit output words of RLL-encoded data having both a global constraint Go and an interleave constraint Io on bits of a first value includes receiving N-bit input words of RLL-encoded data having both a global constraint Gi and an interleave constraint Ii on bits of like value; and producing the output words from respective input words by sliding-window encoding of each input word to replace predetermined bit-sequences with respective substitute sequences such that Go Ii.