It's an Ultra320 SCSI drive. From what I understand, it should be LVD. I can take a picture of the adapter I used so you can see what the difference is. The plain Jane adapters had nothing special on them, just a resistor or two, and you can see the traces that reroute the power to the molex connector. Worked fine. The one I tried actually had some other chips on it, looked fancy. The HDD worked up until I plugged the fancy adapter in. After that, it would no longer power up.