In spite of the dramatic improvements in the cost of secondary storage, magnetic disks alone are inadequate for meeting the storage and delivery needs of many modern applications. Novel designs of storage hierarchies are needed if we wish to take advantage of the low cost of tape media but still provide reasonable performance characteristics, in the context of modern applications. Specifically,...

On May 21, 1952, the International Business Machines Corporation announced the IBM Model 726 Tape Unit with the IBM Model 701 Defense Calculator, marking the transition from punched-card storage to digital storage on flexible magnetic tape. That bold introduction was the beginning of what is now a 50-year history of invention that has seen remarkable advances in the storage of information on fl...

1 Abstract In this paper, we evaluate storage system alternatives for movies-on-demand video servers. We begin by characterizing the movies-on-demand workload. Then we study disk farms in which one movie is stored per disk. This is a simple scheme, but it wastes substantial disk bandwidth, since disks holding less popular movies are under-utilized; also, good performance requires that movies be...

1 Abstract In this paper, we evaluate storage system alternatives for movies-on-demand video servers. We begin by characterizing the movies-on-demand workload. We brieey discuss performance in disk arrays. First, we study disk farms in which one movie is stored per disk. This is a simple scheme, but it wastes substantial disk bandwidth, since disks holding less popular movies are under-utilized...

The dyadic Green functions for a uniaxial dielectric–magnetic medium, together with a reversible field transformation, were implemented to derive a formulation of the Huygens principle appropriate to a uniaxial dielectric–magnetic medium with gyrotropic–like magnetoelectric properties.

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 CHAPTER

We give a simple model for interferences occurring in 2-D patterned media for magnetic recording. We investigate some constraints induced from the model. We also give an encoding algorithm for the constraints which works well with minor exceptions.