Moving large Trees with DOS is not a very good idea.
The likelihood of error is rather high.
Files may be in use or marked as read-only which will cause errors.
First copy, then if no errors, remove original files and folders. Better yet, use a program made to do this kind of work. Windows has a application call 'Sync Toy' that could be used.
SyncToy 2.1
Brief Description
SyncToy 2.1 is a free application that synchronizes files and folders between locations. Typical uses include sharing files, such as photos, with other computers and creating backup copies of files and folders