A recording clock generating apparatus for a data recording system includes a wobble signal sampler which samples a wobble signal, from wobble grooves of an optical disk. The switch device includes a first switch, a second switch, a button, and a pusher. In some embodiments, the sorbent device can include at least two sorbent materials fluidically coupled to the longitudinal diffusion path, in which the sorbent materials are arranged from a material with a weakest sorbent strength to a material with a strongest sorbent strength with the weakest sorbent strength material adjacent to the sampling inlet. Materials for the flexible-layered structure include woven textiles, non-woven materials, flexible plastics, natural leather materials, artificial leather materials, reflective flexible materials, opaque flexible materials, translucent flexible materials, light-diffusing materials, and specular reflective materials. If so the NUC algorithm is applied, which recursively uses both spatial and temporal information from near neighbors as a basis to correct fixed pattern noise on the detector array. The result of the comparison may be used to determine whether the contents of the collection of associated files match a reference.