Introduction

Create a bootable USB drive for Mac OS X El Capitan, Yosemite, Mavericks, or MacOS Sierra.

Image 1/2: If you have already previously downloaded this file, you can find it in the '''"Purchased"''' tab. Image 2/2: If you have already previously downloaded this file, you can find it in the '''"Purchased"''' tab.
  • Search and download the installation file from the Mac App Store.

  • If you have already previously downloaded this file, you can find it in the "Purchased" tab.

In US English, the tab is called "Purchased"

momefarley - Reply

Thank you for your correction but, you could do it yourself by clicking translate

Anthony Fassler -

Image 1/1: Go to '''install OS X''' and '''Quit OS X installation'''.
  • After the downloading process is complete, exit the Mac App Store. The installation window should appear momentarily.

  • Go to install OS X and Quit OS X installation.

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Image 1/1: '''Warning''' your key will be formatted afterwards, make sure that there aren't any important files on your USB key.
  • Insert your USB key into the USB port of your Mac.

  • Warning your key will be formatted afterwards, make sure that there aren't any important files on your USB key.

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Image 1/3: Click it to launch the '''Terminal'''. Image 2/3: Click it to launch the '''Terminal'''. Image 3/3: Click it to launch the '''Terminal'''.
  • Do a search with Spotlight or go to "Applications / Utilities" to launch the Terminal.

  • Click it to launch the Terminal.

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Image 1/2: '''For El Capitan :''' sudo /Applications/Install\ OS\ X\ El\ Capitan.app/Contents/Resources/createinstallmedia --volume '''/Volumes/MyVolume''' --applicationpath /Applications/Install\ OS\ X\ El\ Capitan.app Image 2/2: '''For Yosemite :''' sudo /Applications/Install\ OS\ X\ Yosemite.app/Contents/Resources/createinstallmedia --volume '''/Volumes/MyVolume''' --applicationpath /Applications/Install\ OS\ X\ Yosemite.app
  • In Terminal insert one of these command line :

    • For El Capitan : sudo /Applications/Install\ OS\ X\ El\ Capitan.app/Contents/Resources/createinstallmedia --volume /Volumes/MyVolume --applicationpath /Applications/Install\ OS\ X\ El\ Capitan.app

    • For Yosemite : sudo /Applications/Install\ OS\ X\ Yosemite.app/Contents/Resources/createinstallmedia --volume /Volumes/MyVolume --applicationpath /Applications/Install\ OS\ X\ Yosemite.app

    • For Mavericks : sudo /Applications/Install\ OS\ X\ Mavericks.app/Contents/Resources/createinstallmedia --volume /Volumes/MyVolume --applicationpath /Applications/Install\ OS\ X\ Mavericks.app

    • For Sierra : sudo /Applications/Install\ macOS\ Sierra.app/Contents/Resources/createinstallmedia --volume /Volumes/MyVolume --applicationpath /Applications/Install\ macOS\ Sierra.app

  • Replace the path "/Volumes/MyVolume" by your USB key. Remove the current path then drag and drop.

  • If you did not download the file from the Mac App Store, you must modify the file path after "applicationpath".

Are these referring to the OS you're making the bootable device for or the one you're making it from?

Joshua Montzka - Reply

Looks like it is probably for the OS that you are installing.

Joshua Montzka - Reply

Yes it's for the OS that you want installing on USB key.

Anthony Fassler - Reply

Image 1/2: Enter your Mac's user password. Image 2/2: '''Your password is not displayed, but it is there.'''
  • After changing the path, press the "Enter" key.

  • Enter your Mac's user password.

    • Your password is not displayed, but it is there.

  • Press "Enter" after having entered your password.

  • Check the name and path of your USB key. If it is correct, press "y" then "Enter".

  • The creation of the key will begin. Please wait until the process ends.

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Image 1/1: Now you can restart your Mac from your USB key by pressing the '''"alt"''' key while it is turning back on.
  • When the Terminal tells you "Done", the creation of your bootable key has succeeded.

  • Now you can restart your Mac from your USB key by pressing the "alt" key while it is turning back on.

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Anthony Fassler

Member since: 02/26/2015

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14 Comments

if it is possible with power iso i have installed this one on my system. http://standaloneinstaller.com/download-...

kennieboezi - Reply

You mean create a USB key from Windows ?

Anthony Fassler -

I'm thinking of using this method to revert back to an older os due to my mac slowing down with Sierra. Will I be able to install just Yosemite or el capitan? Without installing previous os upgrades? This way I can have a fresh mac book.

skylerzanth - Reply

Hello,

Yes you can but with this method, we must make a clean install.

So, please sure you save all your data to another hard drive.

Anthony Fassler -

Réparer ma clé usb

Marc Pitchebai - Reply

clé usb bloquée je cherche à réparer

Marc Pitchebai - Reply

Comment réparer ma clé USB bloquée ?

Marc Pitchebai - Reply

quelle solution trouver

Marc Pitchebai - Reply

Hi, I made a USB bootable drive with el capitan on it. Everything worked fine. I replaced my old hdd with the guide from this site. My iMac is from 2007. But now when I try to boot my computer with the Usb drive while holding the option key I only get a grey screen with a cursor. Any ideas?

Matthias Caes - Reply

Hi,

You must press the Option / alt key immediately after pressing the start button (no need to wait for the startup sound) and normally you can select your usb key.

Anthony Fassler -

That's what I do though. With all the other key combinations I end up with a blinking folder icon with a question mark. i have tried the vpram reset as well so the problem isn't my keyboard. Could it be the usb itself? Or some other problem? If I did something wrong during the hdd replacement I figure I wouldn't have gotten this far, no?

Matthias Caes -

So, it probably comes from the usb key. When you had done it is that the key had the name of the operating system?

If that is not the case then there was a problem when creating.

Try any other usb port though, it's not already done.

If it still does not work, it will be necessary to put back your old hard disk to be able to start your Mac and follow the tutorial above (be careful to respit spaces and characters in step 5).

And check by pressing "alt" that this works well before putting your new hard drive.

Anthony Fassler -

I used a PC to make the usb drive. Downloaded the installer from the App Store and then transferred it to a pic where I extracted the .dmg file from the installer. I used a programme called transmac. I will see if it is possible to make the usb on another Mac. I know the whole process of making the usb drive on a pc was a detour but I didn't really have any other options... Thanks anyway for the help. I'll post back with progress.

Matthias Caes -

Sorry about forgetting to post back. I did the whole procedure on the PC again and it turns out I skipped a step so it all worked eventually. Thanks again for all the help. I feel like my youth playing with LEGO Technics has somehow contributed for my success, but this site was wonderful in all its simplicity!

Matthias Caes - Reply

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