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samsung evo 850

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    Help: Could not mount disk1s2 after erase

    Hey, I'm new to this forum and, don't know much about Mac. I have a Macbook Pro mid 2012 edition. I recently Installed a used SSD (Samsung Evo 850 250gb) in place of my HD, and took out the optical drive and placed my HD there instead. I have a USB to boot High Sierra on the new SSD, which...