I am a computer literate (retired programmer) Windows user trying to help a non-computer literate friend move all of the files from an old external hard drive to a new external drive. I copied the files from the old drive to the new drive using FreeFileSync. All of the files copied except 15 which generated the error "Error code 13 Permission denied". I restarted the system, tried again and got the same error. I then tried to copy the files in Finder. When I selected Copy from the menu the spinning progress indicator started and never stopped. I was not able to select a destination folder. I looked at the permissions for one of the files and the permissions showed that the user has read-write permission. Can anyone suggest how to diagnose and fix this problem? Thanks.