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Once you install Yosemite, the file will automatically erase itself, so it's important to make a bootable drive first.
If you want to install first and then make a bootable drive, make a copy of the installer app in another location so you can access it later.. Worst case scenario is downloading the large file again from the Mac App Store, but then why make a bootable drive? The Easiest Way: Use DiskMaker X By far the easiest way to create a bootable drive is to use the DiskMaker X application, which automates the entire process in the next method.
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create bootable yosemite usb from windows Download Stereo Mix Vaio Windows 7
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