I have a Sony MD, same model as yours, Ustas. I bought it in '06, and it was dead by '08, with batteries impossible to buy except online from Sony or huge online store,certainly not on the the drive from Berkeley to Jacksonville, betweeen venues. That is why my Jacksonville recording is lossy. Emergency purchase.
It does not have a usb port.
I don't know if your minidiscs will fit into it. Almost every thing of Sony's is incompatible with everything else. I'll be happy to send it to you, Matt, along with cables and stuff if you want to try it.
In the meantime, I've got to buy a decent recorder and new mic for next year. Suggestions? Edirol for the recorder, I think. Any particular model? Little concealable mic?