A method is provided for preserving the transverse biasing of a GMR read head during back-end processing. The unbundling separates transactional aspects from storage aspects. Integrated into the plenum duct is a pressure released membrane which is positioned so as to effectively isolate one of the strainer modules from the remaining active strainer modules included in the strainer system. Such a phase selection control word could includes 3 sector indicating bits and phase interpolating bits for an 8 clock scheme.