macOS Sierra (10.12) and El Captan (10.11.6) on a single bootable 16GB USB disk + 3GB of free space allows you store other files, such as frequently used installers. Compatibility InformationMac computers introduced in late 2009 or later can be upgraded to macOS Sierra. For details about your Mac model, click the Apple icon at the top left of your screen, choose About This Mac, then choose More Info. macOS Sierra requires at least 2GB of RAM and 8GB of storage space and will run on: * iMac: Late 2009 or newer. * MacBook: Late 2009 or newer. * MacBook Pro: Mid 2010 or newer. * MacBook Air: Late 2010 or newer. * Mac Mini: Mid 2010 or newer. * Mac Pro: Mid 2010 or newer. OS X El Capitan requires at least 2GB of RAM and 8GB of storage space and will run on: * iMac: Mid 2007 or newer * MacBook: Late 2009 or newer. * MacBook Aluminum: Late 2008. * MacBook White/Black: Early 2009 or newer. * MacBook Retina: Early 2015 or newer. * MacBook Air: Late 2008 or newer * MacBook Pro 13-inch: Mid 2009 or newer. * MacBook Pro 15-inch: Mid 2007 or newer * MacBook Pro 17-inch: Late 2007 or newer * Mac Mini: Early 2009 or newer * Mac Pro: Early 2008 or newer * Xserve: Early 2009 Of these computers, the following five models were equipped with 1GB RAM as the standard option on the base model when they were shipped originally. They can only run OS X El Capitan if they have at least 2GB of RAM. * iMac: Mid 2007 * iMac: Early 2008 * Mac Mini: Early 2009
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