I am trying to backup a DVD onto a Dual Layer DVD+R. I used k3b to backup the ISO to my hard disk. I then tried to burn it using K3b, I got the following few lines:

-media is not formatted or unsupported
-write failed: Wrong medium type
-K3b detected a problem with the media
-Please try another media brand, preferably one explicitly recommended by your writer's vendor
-Report the problem if it persists anyway
-Unable to eject media

I looked around the forums and found some that suggested that I needed a "Dual layer DVD burner." This does not make any sense to me, I would not think that you would need a special burner just because the disc has more space. I normally back my DVDs up on 4.7gb discs after shrinking them with DVDShrink. The problem was I couldn't shrink certain movies so I decided I would try a DVD+R DL. Am I doing something wrong or do I actually need a Dual Layer Burner?

After looking around for a but, I found that growisofs, used by K3b does not support Dual Layer Discs. This would probably explain my problem. Does anyone know of another program I can use to burn an ISO image to a dual layer DVD?

Yes, you need a burner that will support the Dual Layer discs. An older DVD burner will not work with them.

And as soon as you get the DL burner do a firmware upgrade.

Thanks, I guess I wasted my money on these discs. Oh well, at least now I know.

on the contrary, your disks are an *investment* you actually baught a reason to buy some shiny new hadware

dual layer disks are exactly what they say, there is another data layer underneath the first, old drives cant see this layer so cant write to it

some old drives will burn a dual layer disk but only use 1 layer.