Disc Definition Structure(s)

[Willezone]

Under Disc definition structure in the right pane it will show status,such as Quick-Full ,Certified .on a Rewriteable  BDRE/Dl,. What is Scanned: i ask. It always says:No.

I have tried discovery mode and still my disc says Scanned:NO When or how(or should i say What) is the difference in structure/formatting?. ThanksWillezone