Logical data tracks extending among a plurality of zones of physical tracks of one or more disk devices

In apparatus for storing data in a plurality of spaced apart physical tracks in a first predetermined number of disk data storage devices, said first predetermined number being greater than unity, each said device having at least one rotatable data-storage disk;

• including, in combination:
• each said device having one or more disk recording surfaces, each surface having a second predetermined number of recording zones, all of the recording zones having a like predetermined number of addressable data storing physical tracks, each physical track in each zone storing a like-number of data bytes, the physical tracks in different zones storing a different number of data bytes wherein a radially outwardmost zone has physical tracks storing a maximal number of data bytes and zones of decreasing radial positions respectively having physical tracks storing fewer data bytes;
• and
• manifold means connected to said each said device for establishing a given plurality of groups of predetermined ones of the physical tracks for enabling addressably-accessing each of said groups of physical tracks as one logical track, predetermined ones of the plurality of physical tracks in each of said given plurality of groups being in a plurality of the recording zones, said manifold means having a given plurality of manifold indicating means for establishing a plurality of manifolds of said groups of physical tracks, each of said established manifolds having logical tracks beginning in respective ones of said devices.