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Q: loaded bootcamp to install windows 7 and the whole hard drive got reformatted to windows how do I put apple operating system back ... more
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Feb 14, 2015 7:58 AMby Loner T,Use OS X: About OS X Recovery - Apple Support to re-install OSX. The other option is to use OS X: Installing OS X on an external volume - Apple Support and boot from it and correct the partition sizing. You will need to re-install OS X and Windows on the internal drive, or restore OS X from a backup and then re-install Windows with the partition size you need.
