Now, TomDart(me) must eat a tiny bit of crow and still remain confused.  I took the disc to work and the Dell pc there opened the images with no problem.

Yet, still, this remains:   My burner/reader opens other discs from the same time period with no problems.  The suspect disc will not render complete images on my pc.  The recovery program did restore some small images which were not readable directly from the disc.

New discs record just fine and read as should.  So, what is going on?

Still, corrupted disc or not..or patially corrupted disc..or hardware or drivers..whatever, the info in this thread about backups should certainly be valuable to others who use no other forms of backup..even if the problem I am facing with the disc is unresolved as to true reasons why.

I will attempt to move the images from the disc from another pc if it reads the files to my pocket memory(2gb jump drive).   At least, with that, the images will be salvaged for better backup.

Thanks for all the fine input.       Tom.