Shingled magnetic recording (SMR) is a technique to increase capacity used in hard disk drive magnetic storage. Conventional hard drives record data by writing non-overlapping magnetic tracks parallel to each other, while shingled recording writes new tracks that overlap part of the previously written magnetic track, leaving the previous track thinner, allowing for higher track density. The tracks partially overlap similar to roof shingles. The overlapping-tracks architecture slows the writing process since writing to one track often overwrites adjacent tracks, and requires them to be rewritten...