A dual etch depth slider air bearing surface includes a front pad disposed along the front and partially along the sides of the slider and a rear pad partially disposed along the rear of the slider, wherein a skewed center rail connects the front pad to the rear pad. In the preferred embodiment, the device consists of a case with enclosures and is of a portable nature so as to accompany an individual easily. Thereby, the decoupling of the pre-stage and post-stage working modes is achieved, and the interference suffered during voltage transformation is reduced. The cutter blade portion is supported on the holder movable between an upper position and a lower position.