Need help burning a 800Mb disc
 

I m currently using a Lite-On LTR-40125s (40x12x48x) . I have tried 2 overburn a 800Mb disc but to no avail using Nero version 5.5.9.17 bundled.

I have already enabled overburn 'disc-at-once' burning option on but to no avail. Any1 can help me?