Hey guys, I can get the Seagate expansion 4tb external for $144, which is cheaper than the Seagate Barracuda 4tb internal drive. However, I am wondering if the Seagate expansion 4tb external is the exact same drive as the Seagate Barracuda 4tb 5900rpm? I cant find the info anywhere. If would be cheaper for me to open it up and remove the hard drive from it if its the exact same model. Thanks.