Hi, for some reason, one of the internal hard disks I bought for my mac pro wasn't showing in my finder. It shows up in disk utility--just not the finder. I wasn't sure what to do, so I decided to "erase" it (even though I never used it), and then to reinitialize it, or whatever, with the hope that it shows up in finder. So, I chose to erase it some 7 hours ago, and I still get the message "unmounting." Is this normal? The drive is a TB, so is that why it's taking so long?