Chris is trying to transfer almost 2TB of information from one drive to another, but it just shuts down. Leo says it's likely that the file sizes are just too big for Windows to handle. He has to be sure he's using NTFS. FAT32 has a limit of 2-4GB.
If he's using NTFS, he'll need to use a better copy program like FastCopy or TeraCopy. The chatroom likes RoboCopy, which he can access from the command line in Windows, as well as GoodSync. All these are better than the conventional Windows copy utility. He should also be careful about file corruption.