Finding which files the migration assistant failed to transfer I ran a transfer of about 4 TB of files from my failing Mac to my new Mac. After 62 hours of direct connection transfer time (which seems inexplicable), I was told at the very end of the process that not all files could be transferred without telling me which ones I may have still stuck on my old Mac.
Is there anyway I can get a list of the failed transfer files or do I have to start the entire process over and hope it doesn't fail a 2nd time over the 3 day span of time?
Open a terminal and execute:
diff -qr /Volumes/newharddrive /Volumes/oldharddrive

you have to change the names of the hard drives (or directories) according to your setup.
diff -qr /Volumes/newharddrive /Volumes/oldhardrive | grep ' differ'

is a variant to reduce the output clutter.
You can redirect the output from the terminal to a text file for easier reading:
diff -qr /Volumes/newharddrive /Volumes/oldhardrive &gt;compare.txt