A disk drive has multiple disk surfaces and corresponding heads, each disk
surface includes multiple regions, and each head is for recording on and
playback of information from a corresponding disk surface. The data track
density in a first region on a first disk surface is greater than the
data track density in a first region on a second disk surface, the data
track density in a second region on the first disk surface is less than
the data track density in a second region on the second disk surface, the
first regions are radially similarly situated regions and the second
regions are radially similarly situated regions.