FiLE CoPYING issues

How many files are you talking about? 100GB is a lot.

What I would do, is grab a bunch of files (about 10GB) at a time and put them in another folder. Repeat doing this until you have 10 folders. Try copying to the external one folder at a time. If a folder copies with no problems, take those files and move them back to their original location and then move on to the next folder. Once you encounter the error, you now know which folder has the bad file. Proceed copying the other folders one at a time. If you encounter any more errors, then you may more than one corrupted file.

Now you can start to isolate the folder(s) containing the corrupt files, by repeating the same process.

This is a bit tedious, but faster than trying to find the corrupted file(s) one by one.

 

You could probably write/find an apple script or shell script to do this and skip/list the corrupt files...