I just got a new iMac and am transferring all of the files from my many external drives onto a new 6TB drive. Because I have so many files, the Finder Copy window will give estimates of 6 or 7 hours. I'll get a couple of hours into the transfer of files and get an error message stating that the operation can't be completed because one of the files can't be read. Why doesn't the computer either give you this error message and give you the choice to continue the transfer and negate the errant file....or just do the entire transfer and let you know about the file it couldn't copy at the conclusion of the transfer? Why does it not only not complete the transfer, but also UNDO all of the files that it has already transferred. This doesn't seem logical at all to be an "all or none" scenario when it comes to transferring files.