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Does the Buillt-in Apple Recovery Partition already have an OS X Image or does it download it over internet? I am asking because if it does download over the internet I want to create my own recovery partition from a Yosemite Install application.

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It has to download. In favor of saving space on your hard drive, the Recovery HD is 650 MB of various utilities including one to download and reinstall OS X.

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It has to download. You can make a bootable partition that installs macOS using the free Install Disk Creator. Just follow the instructions there on how to use it, but point it at a blank partition of 8GB or larger.

Source: http://lifehacker.com/how-to-make-a-bootable-macos-sierra-usb-flash-drive-1786853248

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