Superdrive replaced, DVD-DL problem still exists (sorta)

I have a Mac Pro 2 x 2.66 ghz Intel Xeon - the machine shipped with a SONY superdrive up top, and I installed a Pioneer in the bottom slot.
The SONY drive was able to burn dual layer DVDs - I am using Memorex DVD+DL disks. The SONY drive was NOT able to read the DVD dual layer disks that I burned.
The disks are readable in all other machines in my house (All Macs)
I called Apple, they said this is a known issue, and I needed to swap out my superdrive. I just picked it up from the Apple store and it now has an OPTIARC AD 7170A drive, which I believe is a SONY as well.
I just tried burning a dual layer DVD with the newly replaced drive, and it worked fine the first time, however the verification failed. The 2nd dual layer DVD I tried to burn just plain failed - MEDIUM ERROR.
The drive CAN burn dual layer DVDs, but it CANNOT read them. The drive can read and burn DVDs no problem.
Why on earth would the brand new drive fail to read the dual layer DVDs, but everything else reads just fine???

I had very similar problems with the Sony OPTIARC drive in my 2007 Mac Pro (Intel Xeon, 10.4.11).
I found others having the same problems here with the OPTIARC and some said it was 2nd-rate quality. Also - I never liked the noise it made while burning, sounded "cheap."
I got the Samsung Internal DVD/CD 'Super-MultiDrive' DVD DL/CD w/LightScribe. From macsales.com ($29.95 USD). This unit requires you install Patch Burn (software) but runs fine, no more "coasters" from any format DVD, including DVD-R DL (but never tried DVD+R DL). After testing, bought a 2nd one for the lower bay.
The Samsung unit comes with a plastic front (bezel) which must be removed to fit properly. This is easy & quick: illustrated instructions on the macsales.com website.
I wanted the Lightscribe labeling system: no fuss & bother with design / printing labels. Burn DVD, flip it over, launch Lightscribe, enter text in"Edit mode" - click "Print" and 3-4 minutes later your DVD is labeled.
I do wish I could find a way to get both drives working at once (i.e., labeling two DVDs at once, burning two at once). Otherwise: completely satisfied.

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Superdrive replaced, DVD-DL problem still exists (sorta)

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