Yes it does make the same sounds, and yes I can place it in disk mode. By "fluff" if you mean a blockage by dust, or something, in the dock port I did try to blow it clean in case something was there, but discerned nothing.
I'm at a loss at to what the problem is as it's been totally restored without issue, is fully recognized by Windows 10, I have established that the driver is in place, iTunes software is current, and my other 6 iPod 160gb classics work just fine. The last observation leads me to the conclusion that it has to be the device itself; thus my query as to what other troubleshooting I need do with the physical device.
I do appreciate your timely response to my initial query, and will further appreciate any other advice you might be able to provide.
PS: I just turned the iPod in question off/on again but DID NOT HEAR any sounds this time, yet the device shows as fully charged. Does this mean something to you?