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You can boot any El Capitan-compatible Mac from your new installer drive. You can rename the drive (in the Finder) if you like-renaming it wonвЂ™t prevent it from working properly.

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Done., as shown in the screenshot above, the process has finished.Д¬reateinstallmedia will have renamed your drive from Untitled to Install OS X El Capitan. The procedure can take as little as a couple minutes, or as long as 20 to 30 minutes, depending on how fast your Mac can copy data to the destination drive. Making disk bootableвЂ¦ Copying boot filesвЂ¦ Copy complete. You also see a list of the programвЂ™s tasks as they occur: Copying installer files to diskвЂ¦ Copy complete. The Terminal window displays createinstallmediaвЂ™s progress as a textual representation of a progress bar: Erasing Disk: 0%вЂ¦ 10 percentвЂ¦20 percentвЂ¦ and so on. If you donвЂ™t see this message, youвЂ™re already set. If you wish to continue type (Y) then press return:вЂќ If so, type the letter Y and then press Return.

You may see the message вЂњTo continue we need to erase the disk at /Volumes/Untitled.

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Type your admin-level account password when prompted, and then press Return.Paste the copied command into Terminal and press Return. Warning: This step will erase the destination drive or partition, so make sure that it doesnвЂ™t contain any valuable data.Launch Terminal (in /Applications/Utilities).

Sudo /Applications/Install OS X El Capitan.app/Contents/Resources/createinstallmedia -volume /Volumes/Untitled -applicationpath /Applications/Install OS X El Capitan.app Note that the window that displays the command scrolls to the right.

Select the text of the following Terminal command and copy it.

Make sure the El Capitan installer (or at least a copy of it), called Install OS X El Capitan.app, is in its default location in your main Applications folder (/Applications).

If the drive isnвЂ™t named Untitled, the procedure wonвЂ™t work.) (The Terminal commands I provide here assume that the drive is named Untitled.

Connect to your Mac a properly formatted 8GB (or larger) drive, and rename the drive Untitled.

Your OS X user account must also have administrator privileges.

If youвЂ™re using OS X El Capitan, use these instructions.) (Follow this tutorial to properly format the drive if youвЂ™re using OS X Yosemite or older.

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Your drive must be formatted as a Mac OS Extended (Journaled) volume with a GUID Partition Table. This can be a hard drive, a solid-state drive (SSD), a thumb drive, or a USB stick-an 8GB thumb drive is perfect. To create a bootable El Capitan installer drive, you need the El Capitan installer from the Mac App Store and a Mac-formatted drive thatвЂ™s big enough to hold the installer and all its data. If you donвЂ™t, youвЂ™ll have to redownload the installer from the Mac App Store before you can use the instructions below. If you plan to use the OS X installer on other Macs, or-in this case-to create a bootable installer drive, be sure to copy the installer to another drive, or at least move it out of the Applications folder, before you use it to install the OS on your Mac.

However, unlike any other app, if you run the OS X installer from that default location, the app deletes itself after itвЂ™s done installing OS X. In this respect, the OS X installer is just like any other app you buy from the Mac App Store.

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Like all recent versions of OS X, El Capitan is distributed through the Mac App Store: You download an installer app (called Install OS X El Capitan.app) to your Applications folder. And if your Mac is experiencing problems, a bootable installer drive makes a handy emergency disk. If you want to erase the drive on a Mac before installing El Capitan, or start over at any time, you can use a dedicated installer drive to boot that Mac, erase its drive, and then install the OS (and subsequently restore whatever data you need from your backups). If you need to install El Capitan on multiple Macs, using a bootable installer drive is faster and more convenient than downloading or copying the entire installer to each computer. In other words, you no longer have the same safety net or convenience.Д«ecause of this, I recommend creating your own bootable El Capitan (OS X 10.11) installer drive on an external hard drive or USB thumb drive. But to install or reinstall a recent version of OS X, you must either download a non-bootable installer from the Mac App Store or (via OS XвЂ™s invisible, bootable recovery partition) download 6GB of installer data from AppleвЂ™s servers during the installation process. When OS X shipped on a DVD a good number of years ago, you always had the convenience of a bootable installer-an OS X installer that could be used to boot your Mac if its own drive was having problems.