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I'm trying to read a Snow Leopard installation DVD on an iMac 2009 (it's running El Capitan) and it automatically ejects several seconds after inserting it. Why? How can this be fixed?

  • I had the same problem on a 2009 MBP and 2010 Mac Mini. Unfortunately they're the only machines I have with optical drives, because either the disc has gone bad or I'm having multiple drive issues. – Scottmeup Jul 9 '18 at 23:07
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That usually happens when the disc is damaged or dirty and can’t be mounted. Physically inspect the surface of your disc for scratches or residue, and if necessary clean it with a microfiber cloth (wiping radially, outward). It’s okay to use water or a damp cloth if necessary, but avoid harsh chemicals. And of course wipe your disc dry before trying again.

If this doesn’t work, make sure your DVD drive isn’t the culprit by inserting another DVD and making sure it mounts properly.

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