The below statement makes it seem that your are trying to burn the ISO 
"image" file (which contains a file system) within another filesystem 
(ISO9660 etc).  That is not correct.  Your burner software should have a 
function to burn a raw image file to the DVD without using any file 
system.  If you mount the DVD in a Windows or Linux machine and see a 
single file, the ISO file, in a file browser, then it has been burned 
incorrectly.

--Chris


Assuming it's pilot error on my part, what DVD file system disk format 
*should* I be selecting when using Roxio MyDVD to burn this ISO file 
onto the DVD+R disk? (ISO9660, Joliet/ISO9660, or UDF ?) I selected the 
default in the MyDVD application, but wonder if I should have chosen UDF 
instead ?