Replacement drive [made by HGST] got here today. The seller said they tested this one, and it has no bad sectors. I plugged it in and the computer recognized it immediately. It's also quieter than the previous one. I ran a couple of quick read tests on it and it passed. SMART data looks okay. It's running an extended self-test right now (been running for over two hours) and the temperature is stable at 40℃. I don't know what the upper temperature range is on these, it's an "enterprise" drive so probably pretty high but maybe not as high as a DVR drive (I think some of those are good up to 75℃.)