SuperDrive Won't Recognize Sony DVD-Rs! Works With Most Other Media! ???

Just picked up a brand new spindle of Sony 4.7 GB AccuCORE DVD-Rs. The drive seems like it tries to read the disk but spits it out after a few seconds. I've burned a few TDK CD-Rs this week, so I don't think it's a hardware issue. I also tested a blank Memorex DVD-R, which loaded just fine, and burned an ISO image to it using Toast. I suspect this may be an issue with Sony's media. I noticed that it has the words "DVD-R Ver.2.1/1x-16x" printed on the disc. Does the "2.1" refer to a newer kind of DVD-R that isn't compatible with older SuperDrives? Any insight would be greatly appreciated.
PS: The SuperDrive is a Matshita UJ-835E with the GAND Firmware Revision.

Here are a few links that will help you a ton. I am almost positive that your issue is in fact bad disc from the spindle/ I had the same issue with Memorex only getting or 5 good ones.
http://www.digitalfaq.com/media/dvdmedia.htm
http://www.videohelp.com/dvd
http://www.digitalfaq.com/dvdguides/basics/dvdintro.htm

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