Update: I plugged it in today to try some of the suggestions and found it wouldn't spin up at all, then the drive itself began to smoke, or rather a small chip on the logic board caught fire. Clearly there was an issue here and only a matter of time. Well after 20 years, it was bound to happen one day. The question is, what can be done now? It would seem like I could swap the logic board with another, drive of the same model, or crack open the drive and swap it. Either way, I will have to locate another compatible drive. At this point, could a disk recovery service revive the data (which seems likely it should still be perfectly intact), without going through the exact same steps I have outlined?