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#11
Welcome to the Seven Forums! meem
I assume you are plugging the 3tb drive in by usb and not eSata port correct? You need to see the drive initialized by paying the Disk Management tool a visit. You can opt to bring down to bring down the Action menu and click the rescan if needed. (see attached image)
But once you spot the 3tb volume in the DM you simply right click on that to use the Change Drive Letter option. Windows will then detect and mount the volume on the drive as a new logical drive using the drive letter you select and be seen in Windows Explorer. Often you may also see a flashing popup notification that a new drive had been found as well.