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OS X - Operating System General OS operation information and support

Could not unmount disk: reinstallation


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Bebos0130

 
Member Since: Jul 14, 2013
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Trying to reinstall Mountain Lion on my mac mini.. i have the disk and all, but when i'm selecting my drive, and click to continue. it stops me with the ugly message. COULD NOT UNMOUNT Disk...

WHY .. please?
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Dysfunction

 
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Did you boot from it?

mike
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Got # ? phear the command line!
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harryb2448

 
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G'day and welcome to the forums.

A Mountain Lion disc? Where did you get that as only available as a download.

Hang on to those original install discs like grim death! Using OS X.7 or later make a bootable USB thumb drive before running Installer!
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