Eddy currents in tape-wound cores are classified into microscopic and macroscopic eddy currents. The latter, denoted by ie, exists during mode II among three switching modes. Inherent peak versus for a high drive is computed from measured and , the and φ when is maximum. The expected line density of reversed-domain nucleation centers is computed from . A switching tape-wound core is equivalent to one with "ferrite-core" characteristics that is loaded by a resistance . A special computer program was developed to compute and , the higher FD, the wider and lower the resulting U shaped . Domain-pattern models are proposed. Accordingly, domains in which is generated are encircled by macroscopic eddy currents where and . The semiempirical model , where Rezis Reat , is proposed. The functions describing and include a total of five parameters besides.