Systems and methods for retaining data in non-volatile solid-state memory are disclosed in which refresh copy operations are performed on data stored in non-volatile solid-state memory. Tab sections, ring sections, and a convex stability ridge extend from the bushing and firmly lock the bushing to both the retention bracket and the sway bar while maintaining ease of assembly, minimizing debris buildup, resisting thermal degradation. A database may be used to store and correlate the logical volume identifiers and the identifying or descriptive information. The motor for driving the polygonal mirror wheel has a drive shaft and is provided with a magnet that is an injection-molded part, which is formed onto the shaft and operates jointly with at least one coil. The pushing pillar includes a resilient engaging arm.