Reverse optical mastering for data storage disks

A disk made from a replication process which includes a master disk having a data layer formed over a master substrate, the disk comprising:

• a replica substrate having a first major surface and a second major surface, the first major surface including a surface relief pattern in the form of a track pattern defined by adjacent lands and grooves, the track pattern having a track pitch less than 425 nanometers, wherein the grooves extend down into the replica substrate, the grooves including a groove bottom and the lands including a land top, wherein the land top is flat.

A stamper comprising:

• a stamper substrate having a first major surface and second major surface, the first major surface including a surface relief pattern in the form of a track pattern defined by adjacent stamper lands and stamper grooves, wherein the grooves extend down into the stamper substrate, the stamper grooves including a stamper groove bottom and the stamper lands including a stamper land top, wherein the stamper groove bottom is wider than the stamper land top.