Its a bios setting. Your drive isn't spinning up and reporting itself in enough time. Try disabling fast boot, or look at the settings for the drives. Turn off fast options or add in any delays you can.
Several ideas come to mind. Your either trying to copy onto a file system that doesn't support 4GB+ files like FAT32, you have a dying drive (not sure about this), or you changed something in the bios you shouldn't have. I'd check out the file system first.