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Aug 18, 2015 10:14 AM in response to Jisan3369by Loner T,Was W10 a clean install or an upgrade from a prior Windows version? Please use OS X: Installing OS X on an external volume - Apple Support and boot from this external boot disk and the internal disk can be inspected for issues. A second Mac in Target Disk Mode (Share files between two computers with target disk mode - Apple Support) can also be used.