Rotary head recording system

In a recording system for use with a vertical format single layer flexible magnetic recording medium having first and second sides, an improved data transcription head assembly of the rotating type, including:

• (a) an auxiliary pole having its tip adjacent the first side of the medium;
• (b) a winding around the auxiliary pole;
• (c) a pole carrier having an end face and a periphery whose intersection with the end face is a circle, said pole carrier mounted for rotation about an axis centered on and perpendicular to the circle of intersection, and positioned to place at least an arc of the circle of intersection in substantially contacting relationship along its length across the second side of the medium;
• (d) at least two main poles mounted on the pole carrier, each main pole having its transcribing tip coincident with the circle of intersection such that for each revolution of the pole carrier, each transcribing tip is directed toward and sweeps across the medium along the arc of the circle of intersection in substantially contacting relationship with the medium and adjacent to the auxiliary pole tip, thereby allowing data transcription, wherein at least one pole has a pole tip area of preselected size in substantially contacting relationship with the medium, and another pole has a pole tip area of size relatively smaller in length and width as compared to the first main pole tip.