Hi Tom,
There should be an interface named _INeroDriveEvents_Event, which declares the events of INeroDrive. You can just typecast your "drive" variable to _INeroDriveEvents_Event and assign your event handlers.
Note that I'm not as familiar with the Nero SDK as I'm with COM Interop, so I might be wrong.
Regards,
Ianier Munoz
http://www.chronotron.com