A triple track test for determining respective erase band widths associated with a read/write head involves writing first and second data tracks in each direction and at a certain distance from an origin, and erasing a track having a center at the origin. Based on a triple track test profile (3T) corresponding...http://www.google.com/patents/US7907361?utm_source=gb-gplus-sharePatent US7907361 - Triple track test for side erase band width and side erase amplitude loss of a recording head
