US Patent 9495988 Dependent write fault threshold

Systems, apparatuses, and processes having a dependent write fault threshold are disclosed. A first sector may have a first write fault threshold and a second sector, adjacent to the first sector, may have a second write fault threshold, and the write fault thresholds can be variable based on a position error signal value of an adjacent sector. In some embodiments, the adjacent sectors may each be in an adjacent track. In other embodiments, the adjacent sectors may be in the same track. Further, a track may have two write fault thresholds, a positive direction threshold and a negative direction threshold; in some embodiments, only one direction's threshold may be variable based on the position error signal of the adjacent sector, while the opposite direction's threshold may be set to a default (e.g. pre-determined not on a sector by sector basis) value.