Implementation of variable bit density in storage disc drives

An apparatus for recording data, comprising:

• a plurality of discs, each disc having at least one recording surface, each recording surface including a plurality of radially concentric zones, each zone of the plurality of zones radially aligned respectively on each surface of each disc;
• and
• a plurality of read/write heads, each read/write head associated with a particular surface of a select disc, each read/write head having a plurality of recording frequencies, each recording frequency associated with a particular zone;
• wherein a first read/write head has a first recording frequency associated with a first zone on a first recording surface and a second read/write head has a second recording frequency for the first zone on a second recording surface.