20 23 nm are formed again assuming 5 nm between surfaces 18 and 54 the nodules project above surface 18 by distances in the range of 15 18 nm more broadly the texturing features project outwardly beyond surface 18 by less than about 20 nm at the other end of the scale the nodules preferably project outwardly from surfaces 54 by more than 12 nm these constraints afford considerable variety particularly in view of the options to provide different separation distances between surfaces 18 and 54 and to provide different proportions of contact zone surface area occupied by the recessed region 0059 fig7 schematically illustrates a laser texturing apparatus 60 used to form dual baseline textures in magnetic media substrates such as substrate disk 38 the device includes a support stage 62 that rotates about a vertical axis 64 and a reciprocating support stage 66 on which support stage 62 is rotatably mounted two lasers both stationary are disposed above disk 38 and the support stages a co 2 laser 68 and a yag laser 70 respective beam shaping optics are associated with the lasers including collimating lenses 72 and focusing lenses 74 for bringing the laser beams indicated at 76 and 78 respectively into focus at desired locations on substrate surface 42 of disk 38 in one particularly preferred fabrication approach a glass ceramic substrate disk 38 is first treated in a vacuum deposition process in which a uniformly thick carbon layer is applied onto surface 42 the preferred thickness of the carbon layer is at least about 5 nm more preferably in the range of 5 10 nm the result of the carbon.