Yes, there is an easier way.
A very simple way would be to try moving some of the files at a time.
You have 400 movies.
Try moving 20 at a time.
Perhaps you have some corrupted files "in there" somewhere.
If so, the finder may "choke" on those files, and halt the transfer.
When you move files in smaller "chunks", it becomes easier to detect corrupted files.
KEEP HANDWRITTEN NOTES as to what's been transferred, and what has not (yet).
This may not be "less time consuming", but it should get the job done.
ANOTHER WAY:
Download CarbonCopyCloner from here:
http://www.bombich.com/download.html
CCC is FREE to download, and it's FREE to use for the first 30 days.
Now...
Use CCC to clone the contents of your source drive to your backup (second) drive.
IF there are corrupted files, CCC will not halt the transfer (as will the finder).
Instead, CCC makes a note of the corrupted file in its log, and goes right on with the clone.
At the end of the process, CCC will present you with a list of what couldn't be copied.
Again, makes it easier to identify corrupted files.