Can't erase (rewriteable) DVD using Disk Utility

I'm trying to erase a Maxell DVD +RW in my Mac Pro's SuperDrive, but when I click on Erase in Disk Utility (I've tried both Quickly and Completely, and both the drive and the disc itself) it just spins for 30 seconds, and then stops (with all the data still there).
I also downloaded PermanentEraser and dropped the disc icon into the app icon, but it also spun for a while but did nothing. I tried selecting all the files on the disc and manually dragging them to the Trash, but when I try to empty it I receive an error code of -61.
What's going on? Does DiskWarrior somehow create startup disks which can't be erased?

Hey, if you do that ... you can throw disk directly to the trash. if you used fast
erase option, you can only use disk utility !!! trying to that with others software make disk unusable.
when I started to use rewritable disks I did this mistake over more of 10 disks, before I understanded it. Toast warn you, when you use fast erase.

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