A single-mode optical fiber has a cut-off wavelength of 1260 nm or less, a zero-dispersion wavelength in the range of 1300 nm to 1324 nm, a zero-dispersion slope of 0. A first method includes grouping changed nodes into atomic partitions according to the relationships between the changed nodes and existing nodes. Each flange includes a first face and an opposite second face. An encapsulant is deposited over the first and second semiconductor die. The off-track capability and track mis-registration of an element or head can be determined and used to set individualized thresholds for elements or heads of devices including rotatable storage media. By shifting the contact pointy laterallyoutwardly, the knee stability gradually increased.