[MacDV] Navigational DVD copy

[Dennis Fazio]

Is anyone familiar with the DVDs that come in the navigational  
computers in cars? I have one in my Honda and would like a backup  
disk in case anything goes wrong with it. Then I don't have to wait  
for a week to get a new one from the dealer (they don't stock them).  
Honda won't get me a spare one without paying full price for a new  
purchase ($185).

I was able to rip it to my disk to make my own copy, but it is a data  
disk and is 7.64GB in size. I don't think I want to use the usual  
method for Video DVDs with compression. (My AL PowerBook can only do  
4.7GB) Since this is larger than the single-layer 4.7GB DVD, I assume  
it's a dual layer disk.

Is that assumption correct?  If so, could I just find someone with a  
dual layer DVD  burner and make a copy from my 7.64GB disk image?
--
Dennis Fazio
dfz at mac.com