The paper describes internal gravity waveguide modes. using dissipative solutions above the source. We compare such a description with an accurate approach and a WKB approximation for dissipationless equations. For waveguide disturbances. https://www.roneverhart.com/Western-Digital-Red-WD80EFZX-8TB-5-4K-RPM-SATA-6Gb-s-3-5-HDD/