An information-storage media is provided that includes: (a) a substrate
disk 312 having first and second opposing surfaces; (b) a first selected
layer 304 on the first surface, the first selected selected layer 308 on
the second surface, the second selected layer having a second thickness,
wherein the first and second selected layers have a different chemical
composition than the substrate disk; and (d) an information-storage layer
412 adjacent to one or both of the selected layers. The first and second
thicknesses are different to provide an unequal stress distribution
across the cross-section of the media.