Table 1.

Geometric and material parameters of the hard disk platter.

Parameter	Value
Young’s modulus, E	71 (GPa)
Density of disk, ρd	2.7 × 103 (kg/m3)
Outer radius, ro	4.474 (cm)
Inner radius, ri	1.56 (cm)
Outer radius of the enclosure, re	4.94 cm
Thickness, h	0.790 (mm)
Poisson’s ratio of the disk, ν	0.33
Density of air, ρa	1.21 (kg/m3)
Speed of sound in air, a	343 (m/s)