The drives appear to be part of a Memorex IBM mainframe compatable system. the drives may be pertec, or may be storagetek, or may be proprietary to the controller that interfaced them to the mainframe system. since these are nasa mainframe tapes, let's hope that they got all the data read before they scrapped the above hardware. I also found numerous references to there being 3490 and probably 3480 compatable drives on this same set of subsystems. also processor.com lists datarefelects computers, http://www.datareflects.com, as having refurbed units, they may respond to a query about the units. If you could post links to the actual cables or interface connecctors, that might help. They might be scsi, but would be differential if so, because single ended was not allowable outside cabinets. The pertec would probably be 2 50 pin connectors, but there was never a really official cable, as the recent overland data discussion indicates, and they made up their own. There was a storage tek drive to controller interface, and they might be oem drives from storage tek. That interface had three db-37 connectors and three cables. if they were following the IBM lead, they would have a pair of cables into the controller placed to be routed under the floor. I think one of them would have been a channel type able, one power. Jim