A crosstalk model considering leakage fluxes and methods to reduce crosstalk between read/write head and pre-erase head

A head combined with a read/write (R/W) and a pre-erase gap is adopted for 4 MB flexible disk drives. Reducing the crosstalk coupling between the erase head and the R/W head is an important factor in the design. We developed a simple design method to analyze the crosstalk using a three-dimensional finite-element method (3D-FEM). We found that there are two flux paths contributing to the crosstalk in the reproducing process: one is the path through the ferrite cores, and another is the path fringing and reentering into the R/W core. Balancing the fluxes through these two paths, it was possible to realize both high efficiency and low crosstalk simultaneously, Furthermore, the crosstalk during the recording process was analyzed using dc-bias recording theory.