Dual Layer DVD+R, Optiarc. Successful burn, no mounting.

Strange one this, and difficult to point the blame on anything in particular.
Got a new Mac Pro (early 2008) recently, all is well so far. I wanted to back up plenty of my stuff onto some Dual Layer DVDs - and burned six discs successfully using Disk Utility for burning cdr files, isos and stand alone (Finder) data.
All burned and verified successfully. All mounted successfully. Applications, programs and so on can be run and opened from the disk, HOWEVER, if I eject the disk and put it back in, it fails to mount, and claims it is blank. Works great if I never eject the disk, but upon reinsertion, the disk is unreadable.
Under an XP installed Boot Camp, there's the same issue. I burned an iso, installed what I needed to install straight from the DVD just fine. Left the disk in, restarted into OSX, the disk appeared on the desktop just fine. I eject the disk and put it back in, .... disk is unmountable. Same disk that installed software from the DVD under XP is also unmountable under XP!
I'm really puzzled, here! Are my disks completely useless? Is the firmware incorrect? Is Leopard failing? I'm only getting this with DL disks - normal DVDs and CDRs are fine.
Anyone else getting this? Anyone able to offer any suggestions?! Thanks!

Ok, so I answered my own question!. If anybody else is having this, or similar problems, I found that a new firmware is available for this drive, and can be found at : http://liggydee.cdfreaks.com/page/en/Optiarc-AD-7170A/
And I flashed the drive using firmware v1.85 - this version now successfully mounts the previously written disks.
Flashed using the Win32 version of BinFlash (http://binflash.cdfreaks.com/) under XP on Boot Camp.

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