A system, method, or device determines whether noise is present on a sampled andor digitized sensed intrinsic cardiac signal based on a moving count of turninginflection points of the signal. Also disclosed is a variable length probe selection algorithm used in designing such oligonucleotide arrays. The insert may act as a base for an extension plate that can be adhered, heat sealed or overmolded over the plate top and insert top to form a deep well plate. When used in combination with a reverse-flow disk drive, negatively pitched sliders facilitate the routing of traces to the head. Multiple axes of pivoting are defined by said apparatus.