Multi-Session CD Burning using Disk Utility v 11.1

I am trying to burn multi-session disk images (*.dmg) to a DVD-RW disc. I am using the Disk Utility which is supposed to do this. You first create a disk image using the utility, then you burn each one to the disk using its Burn tool function. I have followed all the Help directions.
The issue is that you need to check the box "Leave disc appendable" so that multiple sessions can be burned. When I try this, this check box feature is grayed out and I can't enable it.
I have repaired the permissions and the disk, this does not fix the issue.
Any help would be appreciated...

It appears that multisession DVD's are not supported properly through DIsk Utility.
As ever, you have choices.
There is the hard way (that has the redeeming feature of being free): http://www.math.nyu.edu/aml/CDwrite.html (yes this covers DVD's too).
There is the easy way (that costs a bit of cash, although your first 20 burns are free):
http://freeridecoding.com/burnagainfs/index.html
However with a DVD-RW you can erase the disk and reuse it with Disk Utility. Just click on your DVD drive in the left hand panel of Disk Utility and follow the instructions.
Cheers,
Rodney

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