I had this external setup as my Time Machine external, and I no longer want to use it for that. So, I plugged it in, deleted all the saved days and data. I have another external HD that I plugged in, it shows up, I can watch/listen to all the files, etc on the Mac. I want to move these files onto the external that was being used as Time Machine. I can't. I can't directly drop and drag them. I can drop and drag them to my Mac fine, but again when I try to add them to the old Time Machine external, it won't work. I get "Cannot be read or written" Error Code 36 (Actually, I was able to move like 2% of files, but 98% give me that message) Do I have to reformat something, or what? I searched that code, but couldn't really figure anything out.