Firstly, the Wii is capable of reading dual layer discs. This was stated by nintendo themselves a while back.
Plus if you look at this image taken by yours truely you can clearly see that the disk is labled "RVT-R Single layer disk". If the Wii was unable to play dual layer disks why would they need to specify that this disk is single layer wouldn't it simply say "RVT-R Disc"?
[RVT-R Pic]
Secondly this isn't the method of booting backups i mentioned the other day AFAIK. But if one method is being tested, who's to say another isn't also? But i'm still skeptical til i see further proof. New Years day is just around the corner...
The question I have is, how did you get that RVT-R disc?
And, will you be my friend?