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    Default Removing the original start up disk..

    So I did a new partition and installed Yosemite.. all went well and works.. Now I want to remove my original start up disk but I get an error message Couldn't unmount disk..

    So now I have a hard disk with 2 partitions one with my old os and one with Yosemite..
    I only want the one with Yosemite..
    What to do ??

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