The erasure of high energy tapes

In this paper we describe our studies on the erasure of high energy tape. We have found that the bulk degaussers designed for erasing low coercivity tape cannot adequately erase high energy tape. We also show that increasing the strength of the ac erase field is not a practical solution. We then describe the new techniques we have developed to adequately erase high energy tape. These new techniques employ a combination of dc fields and conventional bulk degaussers. We also show the importance of the direction of the erase fields. Finally, we present an explanation for our findings and show how a bulk degausser can be designed using the results of our studies.