Attached Link: http://www.2brightsparks.com/welcome/backup/freeware.html

Whenever I'm copying a lot of files, I use SyncBack (I've linked to the free version). If there's a failure, you can just re-run the profile to repeat the process and not have to remember what you had and hadn't already copied. Apart from that, it just seems to work better than Windows Explorer's copy. ;)