Select Install macOS (or Install OS X) from the Utilities window, then click Continue and follow the onscreen instructions. Learn more For more information about the createinstallmedia command and the arguments that you can use with it, make sure that the macOS installer is in your Applications folder, then enter this path in Terminal.
See also: For most users, this is the best way to upgrade because it means your existing programs and data remain where they are. Sometimes, however, you don't want to do a regular OS upgrade. Maybe you want to start fresh or maybe you need to install El Capitan on a machine that doesn't already have OS X installed. For those users, the best bet is to do a clean installation, erasing the hard disk and installing from scratch. If you want to do a clean install of OS X El Capitan on your Mac — or on a new hard drive — you can do it, it just takes a bit of work. If you've gone through the clean install processes in the last few years, these instructions will look familiar.
(That's because they are almost the same as past years, albeit with changes made for the proper OS name). With a little time, it's relatively easy to create a bootable copy of OS X El Capitan that you can run from a USB stick or other drive. Note: A clean install will erase all of the contents on your disk drive. Make sure to back up your important files, settings and apps before proceeding. El Capitan Clean Install. First, I'd like to thank forum member for his instructions on creating a manual bootable USB copy of OS X Mavericks back in 2013.
His work made it easy to update the instructions to work in El Capitan. This method requires using the Terminal app.
If you're not comfortable typing commands into Terminal, just use the DiskMaker X app (above). To continue with using Terminal, follow the steps below. After downloading OS X El Capitan to your Applications folder and formatting your USB drive (make sure it's called 'Untitled'), open up the Terminal app. Paste the following command into the Terminal window and hit enter:. You will be prompted to enter in your user password.
Then, you'll see a list of processes on the terminal screen that read: Erasing Disk: Copying Installer files to disk. This process runs a special mode built into the OS X El Capitan installer that can create installable media. The disk you're copying the media onto becomes bootable, too. The process takes less time than DiskMaker X, but you'll need to follow the instructions exactly. Don't move the installer to another folder, and make sure you don't have more than one disk drive titled 'Untitled' connected to your machine.
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