Mechanical performance of laminated discs

Laminated discs are one of the enabling technologies to increase areal dens ity of a recording disc drive to beyond 100 G/in(2), Enhanced damping chara cteristics do, however, come at the expense of axial rigidity of the substr ates, This work demonstrates that by varying the polymer thickness damping and axial rigidity of the substrates can be tailored to achieve desirable p erformance, Laminated glass-ceramic substrates are shown to offer effective damping even with poor lamination. Disc deflection during a shock event is damped out within a few cycles of vibration for the laminated discs, which should provide additional margin for head slap damage. There is no signifi cant clamping induced distortion found for the laminated discs. Overall, me chanical performance of the laminated discs are satisfactory provided lamin ation process is optimal.