MacBook Pro :: Erase Corrupted SSD Internal Drive - Can't Unmount Disk

Dec 6, 2014

I'm trying to erase my SSD internal drive that is corrupted software (Yosemite).I'm booting from an external with 20GB Yosemite OS & 480GB that contains files I've dragged off the internal SSD.I'm getting the error:Volume Erase failed with the error:Couldn’t unmount disk.How can I get around this?

Info:
MacBook Pro, OS X Yosemite (10.10), 13"

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Info:
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Info:
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Info:
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