Maybe I am completely mistaken about how to use record able optical drives, or maybe the drive in my new 20" iMac only reads DVD DL rather than being able to write it too, but when I popped a blank DVD+R DL disc into my iMac it shows the disc as having 0 bytes occupied and 0 bytes free. What am I doing wrong? I tried to drag and drop a file to the disc but it said there was some kind of error. Do I need to format the disc first or something. Yes, I know that little about recording to optical drives, sorry.