A CDRW / CDR may sometimes fail to be burnt for some reason. In order to make the disk useable and writable again, we can "reformat" or "erase" the CDRW. In a Wintel environment, NERO-Burn works fine. In OSX, I find nothing works other than Toast. I've tried X-org and drutil but they fail to recognize there is a valid media inserted. I wanna find an alternative solution and hopefully it is free.