Patent ID: 7362529
Filing Date: 2008-04-22
Classification: G11B

Abstract:
1. An apparatus, comprising: a data storage disk that includes first and second opposing disk surfaces, first disk surface includes first regions, the second disk surface includes second regions, the first regions are arranged concentrically and each includes an inner boundary and an outer boundary at different radial locations on the disk, the second regions are arranged concentrically and each includes an inner boundary and an outer boundary at different radial locations on the disk, the first and second regions are radially similarly situated at essentially the same radial locations and have the same servo track density, the first regions include a first region A and a first region B, the second regions include a second region A and a second region B, the first region A is radially similarly situated to the second region A and has a higher data track density than the second region A, and the first region B is radially similarly situated to the second region B and has a lower data track density than the second region B.