File Size on Disk Image 3.5Gb- 6Gb ???

I'm noticing that disk images created by iDVD 5.0.1 after november 4 are about 6Gb rather than the previous 4Gb (best quality mode, output to hard drive).
There were a number of s/w updates around that date. Anybody seeing similar issues, maybe this even related to a separate post about mpx problems?
Burning these files through disk utility to DVD will obviously fail.

Hi Johan,
You probably have a DVR-109 DVD burner which the OS 10.4.3 update makes it compatible with double-layer in iDVD. You can go to the menu Project > Project Info and switch the Media Type back to 4GB, when you save your disk image again, it will be smaller. When you use the double-layer (8GB) setting, iDVD encoding is different, even if your project is under 4GB, iDVD encodes it such that the DVD data contents are evenly spread across the two layers. Therefore it is bigger than 4GB.

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