Disk Utility launches when I insert a DVD-R

I burned a DVD-R on my MacPro 1,1 using an .iso file and Disk Utility. I ejected the disk, then inserted it into my MacBook Pro for verification. It mounts properly and I can see the disc's contents. Awesome.
However, when I insert it back into my MacPro, where it was originally burned, it doesn't mount. Instead, it launches Disk Utility. Furthermore, the disc doesn't show up in Disk Utility; just the drive info (i.e., SONY DVD RW DW-D150A). No DMG, no ISO, nothing.
Other discs won't mount on my MacPro either. However, I just burned a disc successfully on it--so, it'll burn good discs, but can't mount them. I suppose the drive is bad, but wouldn't all functionality be unavailable if it was damaged? It can burn, but not read? Strange.
All help appreciated!

Interesting...so I changed this setting.
The DVD mounts but the system think it's empty, and it shows up as an Untitled DVD on the sidebar and with the Burn icon next to it. When I take the DVD out and put it in my MacBook Pro, it mounts and displays the contents that are actually on it, contents that were burned with the MacPro that thinks it's a blank disc!
Now I'm really confused. :-\

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