Murkir:
If I was you, I would trust Carl. I too have had those errors and reducing the Burn Speed to 4x eliminated the problem. I don't know what is going on "under the hood" but you should give that a try. PD9 is "talking" to the DVD even before it starts burning, and you can't reuse a blank DVD that fails with that error, at least in my experience. PD9 somehow "marks" it even though nothing is visibly burned on the DVD. Use DVD-RW disks until you ascertain if that is the problem to avoid making coasters.
If that doesn't solve your problem try PRODUCEing your movie and see if that will play on Windows Media Player or whatever player you use. If it won't PRODUCE successfully and fails at the 94% mark, then go into your timeline and find out what is at the point that might be causing the problem.
Do a cold boot before you try PRODUCEing. Sometimes, things get "jammed." If you have a laptop, remove the battery for 60 seconds as well. Computers are marvellous beasts when they work.
The other issue might be lack of disk space to create the necessary temporary files for burning. You should have at least 100 GB free on your primary internal hard drive and everything related to your PD9 project should be on the primary hard drive. A dxdiag file might help us to help you to determine if your computer is capable of handling PD9. Many computers are not.
Hope this helps. Have a great day.
Regards,
-Phil
Windows 10 Pro x64
Dell XPS 8930
Intel CoreT i7 (4.6 GHz)
32 GB DDR4-2666 RAM
1 TB PCIe -x4 SSD
NVIDIA GeForce RTX 2060
PD14 Ultimate x64, 4207
CD4 Ultra and AD6 Ultra
Bleeping Computer Malware Response Instructor