I have a four bay enclosure (hard drives) with two Thunderbolt 2 connections. The T2 connections are the only ones on the enclosure. It is connected to my 2017 iMac Thunderbolt 3 port via an adapter cable. The 4 drives inside are each 6TB spinning 3.5" drives. I have a dock but it has no T2 connector. I would like to connect my enclosure to my iMac via a USB3 port but it appears there are no such cables. Am I correct in my belief that one cannot connect an enclosure with a Thunderbolt 2 port into an iMac USB 3 port?