Leopard install disks being scratched during install

I have had a couple of very strange experiences trying to install Leopard (upgrading from 10.4.10).
I initially ordered (at a special price) and received a Leopard disk under the program whereby I had purchased my MacBook Pro within the month prior to Leopard being issued. When I attempted the install, it moved along fine and then midway hung and finally said the install had failed--disk unreadable. I was unable to start up at all. Couldn't even eject the disk. Finally got it out. Did a clean install of 10.4. Reinstalled all my many programs and was determined to NOT use Leopard.
A few days later I looked at the Leopard disk and found that rings had been "scratched" or "worn" into the data surface as though my DVD reader/player had malfunctioned and been in contact with the disk surface. I was horrified and quickly looked at all my other program disks just used for the reinstallations, afraid the DVD player had ruined them too. They were all ok. This lead me to believe that perhaps the Leopard disk was bad even before I put it in my computer. I called Apple. They issued a new disk with barely a comment.
Well, I finally got around to doing an install of Leopard with the new DVD. I looked carefully at the disk first. No apparent ring scratches. The install worked--really slowly--but it finished and works fine.
However, when I ejected the disk, I took a look and, sure enough...the data side had rings scratched (or worn) into it as though my DVD player had been in contact during the installation process! They were not there before the install. This has NEVER happened with any of the other MANY installation disks (or disks I've burned) on this computer but has now occured TWICE with the Leopard install disk!!!! WHAT'S GOING ON?????
Has anyone else seen this issue?

DavidBJ wrote:
I have had a couple of very strange experiences trying to install Leopard (upgrading from 10.4.10).
I initially ordered (at a special price) and received a Leopard disk under the program whereby I had purchased my MacBook Pro within the month prior to Leopard being issued. When I attempted the install, it moved along fine and then midway hung and finally said the install had failed--disk unreadable. I was unable to start up at all. Couldn't even eject the disk. Finally got it out. Did a clean install of 10.4. Reinstalled all my many programs and was determined to NOT use Leopard.
A few days later I looked at the Leopard disk and found that rings had been "scratched" or "worn" into the data surface as though my DVD reader/player had malfunctioned and been in contact with the disk surface. I was horrified and quickly looked at all my other program disks just used for the reinstallations, afraid the DVD player had ruined them too. They were all ok. This lead me to believe that perhaps the Leopard disk was bad even before I put it in my computer. I called Apple. They issued a new disk with barely a comment.
Well, I finally got around to doing an install of Leopard with the new DVD. I looked carefully at the disk first. No apparent ring scratches. The install worked--really slowly--but it finished and works fine.
However, when I ejected the disk, I took a look and, sure enough...the data side had rings scratched (or worn) into it as though my DVD player had been in contact during the installation process! They were not there before the install. This has NEVER happened with any of the other MANY installation disks (or disks I've burned) on this computer but has now occured TWICE with the Leopard install disk!!!! WHAT'S GOING ON?????
Has anyone else seen this issue?
You might see what happens if you play a movie DVD. Use an old one. Be sure to play it through the switch point to the second layer.
You problem may be that optical drive is damaging dual-layer DVDs for some obscure reason.
Most of the other installation disks you used were probably single-layer disks.
It might also be that the Leopard DVD is a bit thicker than a standard DVD. Check the thickness.
If you do get another replacement DVD I suggest making a backup immediately.
You might also be able to copy the scratched DVD on another machine, but it has to had a DL burner. Sometimes copying a scratched DVD will work, since the copying process re-reads bad areas many times.
If you do get another DVD, use an external drive until you are sure why this is happening.

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