Disk Utility doesn't recognise inserted DVD-R DL

I upgraded to Leopard from Tiger a few week ago and Disk Utility has been working fine for a while. I bought a few blank DVD-R DL disks with 8.5Gig storage capacities, but, when inserted, Disk Utility doesn't show them in the top of the pane on the left side.
It shows the Super Drive, but doesn't show an inserted DVD below it like it usually should.
Any suggestions?
Message was edited by: jemorris55

Alright, so instead of burning to the disk specifically, I burned to the superdrive which automatically burned to the disk. It worked alright and now that the DVD has something on it, its icon pops up in Disk Utility. I don't know why it chenged...

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Disk Utility doesn't recognise inserted DVD-R DL

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