Techniques herein enable executing directed self-assembly of block copolymer patterning processes that result in patterns having no defects or a negligibly low occurrence of defects to have a high yield of functional patterns and devices. Methods include executing a same DSA patterning sequence two or more times such that any defects in from a phase-separated first block copolymer film are corrected with a phase-separated second block copolymer film as any defect in the second block copolymer film would only temporarily cover a feature already created and/or transferred from first block copolymer film.