Physical Format
The medium provides space to store information, but a complete storage system requires something more. It needs a standardized method of organizing that information. That organization may take several levels—a physical level and one or more logical levels. The physical level or format determines how densely information fits onto the medium and how it is accessed. The logical level determines how it is addressed and used.
The physical format of the Compact Disc and Digital Versatile Disc shares a characteristic with hard disks that's the same with most disc-based media—the information is arranged around the disc in long arcs. But whereas hard disks and floppy disks make those arcs into concentric tracks, the CD and DVD turn the ...
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