Yes. Seagate makes a Thunderbolt adapter for thier GoFlex line of external drives. I originally bought the drive as a USB drive, however, since upgrading to a new Macbook Pro (Retina) with Thunderbolt ports, I wanted to utilize the faster IO.
BTW, I just discovered what the problem was. In order for any seagate drives over 2GB in size to be read through the thunderbolt adapter, a special driver needs to be installed. Since I reformantted the mac, that driver no longer existed on my system, hence the inability to read the drive. I found the driver on the Seagate website, installed it, and all is well now.
Thanks everyone for the help.