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I'm trying to install macOS High Sierra and when open the Utility Disks' window ( when restart and hold "Alt") my hard disk internal results "not mounted" , I had "first aid" and it works, not issue. I have a Macbook pro late 2011.
Any advices ? Thank you
MacBook Pro, macOS Sierra (10.12.6)
Yes now it works thank you so much. You’ve been very helpful
Hard disk "not mounted" High Sierra installation
