Can a DVD -R be burned onto a DVD +R

Download ImgBurn: http://download.cnet.com/ImgBurn/3000-2646_4-10847481.html
It can do both read the old disk and put it on new DVD media. It can also tell the user if the drive in use is capable of writing to the chosen media. With the limited info given in the original post, it is hard to give more useful info. Let's start with that and come back with more info about what has been done, with what software, and the hardware being used.
"I tried to burn it onto a +R dual layer disc but the software would not allow it." why not?

If you have enough room/space, copy whatever current DVD-R data onto the HD. Then burn to DVD+R blanks. If you're using the same burning s/w and it fails then you've found your problem. Move to a freebie like CDburnerXP or Imgburn or TinyBurner once the .ISO files have been made to burn to blanks. You gave little info other than the problem, just what s/w and burners are being used?, etc.. Some of the burning s/w may allow better copying action within its own s/w, but if you can make .ISO file, then usually any s/w can burn to whatever DVD blanks. I exclude any "copyright scheme" that maybe at work here thus all the ?'s.

tada -----Willy

If these are ordinary discs without a proprietary format I can use IMGBURN (free, found with google).

I would.

1. Use IMGBURN to create an .ISO on my computer. It's an icon that shows a CD with an arrow to file or hard disk icon.
2. And then I slip in the blank DVD+R to create the next disc with the icon that shows a file/HDD pointing to the CD.

Yes I know the difference of CD and DVD but the icon name is usually "CD".

If this is PROPRIETARY then I'd have to know more.
Bob