Wave function expansion method and vibration theory are employed to study the out-of-plane response problem of the double degree of freedom vibration system installed on the half circular rigid platform on the half space boundary. The total displacement in the half space media was given using elastic wave theory. and the second order constant coefficient differential equations with wh... https://www.roneverhart.com/Western-Digital-Ultrastar-DC-HC570-WUH722222ALE6L1-22TB-7-2K-RPM-SATA-6Gb-s-512e-SED-3-5in-Recertified-Hard-Drive/