Just as a sanity check, I just tried it in the Mac's USB port again, and although the driver is different now (AppleT8103USBXHCI) I see the same behavior with my looping on pmset -g script, where the ports go from USEABLE to None briefly, then back to USEABLE, exactly when the drive spins down and back up.If the device contains any files you want to save, copy them to another storage device or volume.
I had been running this with the drive plugged into a Thunderbolt dock, but I saw the same behavior with it plugged directly into a USB-C port on the MacBook. Hence me constantly hearing the drive spin down then back up almost immediately. Within seconds though, they return to normal. So for whatever reason, those USB ports go from "USEABLE" to "None" state, causing the drive to spin down.
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