I have a Pioneer A05 burner. I recently wanted to get rid of some old data on a TDK DVD-RW disc. I tried to do a 'quick erase' and Nero gave me a 'Internal Target Failure' message and didn't complete the erasing.

Next I tried to do a full erase - same thing.

I also tried DVD Decryptor to do the erasing - No go either

Then, I thought it may be the drive...so I burned some data on a Memorex CD-RW, and erased it just fine.

Then I used a Maxell DVD-RW, burned some data on it and erased the data just fine.

I know its the media after these tests, but I thought TDK was a decent brand for media, and now it won't let Nero erase anything on it. I can READ the data on it, but just can't remove it. Frustrating...