If you plug in a computer and an external drive to two different outlets, that could generate a ground loop. Try making sure they are plugged into the same outlet (such as a power strip). This also applies to any powered device connected to the computer, including mixers, external sound cards, etc.

And if it's a laptop, try John's second suggestion.


BIAB 2025 Win Audiophile. Software: Studio One 7 Pro, Swam horns, Acoustica-7, Notion 6, Song Master Pro, Win 11 Home. Hardware: Intel i9, 32 Gb; Roland Integra-7, Presonus 192 & Faderport 8, Royer 121, Adam Sub8 & Neumann 120 monitors.