DVD Burn Problem

[Calibretto]

ok so I was in the middle of a DVD burn and my electricity goes off. So I turn my computer on again and a I start to redo my burn but I get this message:

This message appeared when I put a new DVD in

 

[The_Other_One]

Sounds like you're running out of hard drive space.

 

[Calibretto]

ya but before the burn I had like 7GB free and after I turned on my computer it showed like 2.5GB