Problems beside DL Disks on mac?

I did burn a DVD+R DL on my mac today, beside 2x speed and mac only disk, it be 7.59 gb.

the disc works perfekt on my mac mini, but when I set it on macbook the disc will be autoejected, why? other dvd-r and video discs works perfekt om macbook

Answer:
I don't believe the MacBook has a DL drive. I thought that any DVD drive could read DL disks, but perchance they can't. My mini has a DL, but my MacBook Pro doesn't.

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