Hi I'm trying to erase a Sony DVD RW to reburn something els. However Disk Utility won't let me, whether I click quickly erase or completely erase it gives me an error that says this

"Erase of optical media did not complete or completed with an error.

See the DiscRecording log file, ~/Library/Logs/DiscRecording.log, for additional information."

I went there for the "additional information" but I didn't understand. Any ideas on how to fix this?