DVD+R DL won't mount...on 3 different drives!

Yikes!....Help!...I'm really stuck....
I've read a lot of the posts here regarding DVD's that won't mount and thanks in advance to those who've offered help. Hope you have some suggestions for me. Here's the deal.
About 4 months ago, the disk, a Memorex DVD+R DL, was successfully burned on my G5, using 10.4.11 for burning. And I was able to mount and read it a couple of times. It's a data-only archive disk of old files.
Over the past month, I've acquired a MacPro 2.8G 8-core (10.5.6) and a MacBookPro 2.61G Core Duo (10.4.11). And this disk will not mount on any of these 3 machines...not the MPro, not the MBPro and not the G5 that it was originally burned on! All 3 machines yield the same result...they kick the disk back out with out any messages..."error" or otherwise. There doesn't appear to be any significant scratching or degradation on the disk.
I've searched the net for a "Mac DVD data recovery" program but;(a.) haven't been able to find one....they're all PC and (b.)don't really see how any software app could "deal" with a disk that won't even mount!
I've had a look at the "upgrade the firmware" options, but it would seem strange that the firmware would be the problem on all 3 different drives.
I'm down to contacting a Pro Data Recovery company, but that'll be expensive!
So any and all suggestions will be HUGELY appreciated!
thanks,
b myers

The usual problem with Memorex DVD's of any format was they didn't burn period, so well done getting one to burn, AND a DL no less. I would try an external DVD burner from LaCie (or LG which makes a good USB one), or even a Windows box to see if anything can read it. A PC with EZ CD Creator or Nero could image and burn on a decent brand of DL (e.g. Verbatim) or even a USB drive.
Cheaper alternative is a 2nd non identical brand drive in the mac Pro, as they do take two.
Diskwarrior is not an option for something that isn't seen and thus is unable to be mounted by the filesystem.

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