"Attempting to copy to the disk "SPACE" failed. An unknown error occurred (-48)." I have an external usb hard drive (named "SPACE") set to contain all of my itunes music and everything that I download. For about a week now, randomly, I'll download something, the download will be successful, and then as the file is about to be automatically transferred into itunes, it'll give me the message above. The file will still exist in my external hard drive in a downloads folder I created, but will not work or allow itself to be transferred into itunes. I'd like to imagine that these are simply corrupt files, but when I first got the hard drive about 2 months ago this never happened, now it's happening with increasing frequency.