What is this error? I've not been able to find a good reason for it. I do back up of files and certain files fail on error 36. The files are off a linux image dump to my mac hard drive. Certain files always fail to copy when doing a bulk/home folder copy. Yet if I manually copy the problem files directly from folder to folder then it works. It's only a problem copying the subfolder over. There is nothing unusual about the files, filenames are short and longer on other files in the same folder. Always the same files, so not some random timeout of the USB drive, and it is a powered 2Tb branded drive. My PC copies as much to it and off the drive with no issue.