Make bootable usb drive

Discussion in 'OS X El Capitan (10.11)' started by mmcxiiad, Jun 8, 2015.

  1. mmcxiiad, Jun 8, 2015
    Last edited: Jun 14, 2015

    mmcxiiad macrumors 6502

    Joined:
    Jul 19, 2002
    #1
    In case anyone is interested, here is how to make a bootable USB drive out of the beta download.

    0. This assumes you downloaded 10.11 beta from the App Store. It puts the installed inside you main applications folder. If you got it from some other source you may have differs results.

    1. Format a USB drive. It must be at least 8gb. You can format it in disk utility. I did it in the new partition tab, HFS+ Journaled. Also, under options make sure it is set as guid. For simplicity I set the drive name to beta.

    2. Run this command in terminal:

    Code:
    sudo /Applications/Install\ OS\ X\ 10.11\ Developer\ Beta.app/Contents/Resources/createinstallmedia --volume /Volumes/beta --applicationpath /Applications/Install\ OS\ X\ 10.11\ Developer\ Beta.app --nointeraction
    3. Put in your password. If you did it right, it should pop up this:

    Erasing Disk: 0%... 10%... 20%... 30%...100%...
    Copying installer files to disk...

    4. Be patient. This WILL take a while. When the process is done, the terminal window will return to the prompt.

    5. After this you can boot from the USB drive.
     
  2. tywebb13, Jun 8, 2015
    Last edited: Jul 28, 2015
  3. mmcxiiad thread starter macrumors 6502

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    Jul 19, 2002
  4. Lazeran macrumors newbie

    Lazeran

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    Jun 8, 2015
  5. tywebb13, Jun 8, 2015
    Last edited: Jul 28, 2015
  6. vickysud macrumors member

    Joined:
    Jun 13, 2012
    #6
    I'm getting an error saying "Install OS X 10.11 Developer Beta.app does not appear to be a valid OS installer application".
     
  7. tywebb13, Jun 8, 2015
    Last edited: Jul 28, 2015
  8. outlawarth macrumors regular

    Joined:
    Mar 20, 2011
    #8
    I have the beta .dmg file downloaded. Any ideas how to proceed?
     
  9. tywebb13, Jun 8, 2015
    Last edited: Jul 28, 2015
  10. slide023, Jun 8, 2015
    Last edited: Jun 9, 2015

    slide023 macrumors member

    slide023

    #10
    I'm getting a kernel panic when I try to boot from usb installer. So I installed over Yosemite. How can I download El Capitan again from App store? the option is greyed out, or how can I restore Yosemite? I don't have it on usb. This on a early 2015 MBPr.

    All is well, my 16gb stick was bad.
     
  11. xplora, Jun 8, 2015
    Last edited: Jul 4, 2015

    xplora macrumors member

    Joined:
    Sep 23, 2010
    Location:
    Hamilton, New Zealand
    #11
    10.10.3 USB drive takes about 6 GB, leaving almost 2 GB free.

    The process to create always wipes the drive being installed onto.

    10.11 DP1 USB drive takes about 6.5 GB, leaving about 1.4 GB free.

    It may be another couple of years before the USB stick will need to be larger than 8 GB.
     
  12. macintoshmac macrumors 65816

    macintoshmac

    Joined:
    May 13, 2010
    #12
    Frankly, if you need ideas to proceed after getting the dmg, you really, really should not proceed with it, regardless of how much you may want to, for the safety of your own data. At best, ask someone you know who knows these things, and remind him to make sure everything is properly backed up so you can get the system restored if things head south.
     
  13. maflynn Moderator

    maflynn

    Staff Member

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    May 3, 2009
    Location:
    Boston
    #13
    Did you try re-downloading the installer? Does the installer start up if you double click it? (you don't need to go through the process just see if it starts up)
     
  14. BasicGreatGuy, Jun 9, 2015
    Last edited: Jun 9, 2015

    BasicGreatGuy Contributor

    BasicGreatGuy

    Joined:
    Sep 21, 2012
    Location:
    In the middle of several books.
    #14
    I just used DiskMaker X 4b4 to create the bootable USB drive.

    Change the name of the install file to "Install OS X Yosemite" and you should be good to go.
     
  15. mmcxiiad thread starter macrumors 6502

    Joined:
    Jul 19, 2002
    #15
    You can try deleting the El Cap from your applications folder. you should only have to quit the app store and restart it and it should see that it isn't on your computer.
     
  16. mmcxiiad thread starter macrumors 6502

    Joined:
    Jul 19, 2002
    #16
    Slight error there. On an 8gb drive, you should see the following:
    total capacity - 7.46GB
    available - 1.32GB
    used - 6.15GB

    Assuming that you rounded up for simplicity, it looks like you accidentally switched used with total capacity.

    elCapUSBusage.png
     
  17. mmcxiiad thread starter macrumors 6502

    Joined:
    Jul 19, 2002
    #17
    I see no reason why you can't. Enjoy the faster read and write speeds.
     
  18. mmcxiiad, Jun 9, 2015
    Last edited: Jun 9, 2015

    mmcxiiad thread starter macrumors 6502

    Joined:
    Jul 19, 2002
    #18

    I have a tech keychain. Basically I purchase a whole bunch of usb drives and have them all on two Cable Key Ring chain linked together. On it I have every version of OS X from 10.6 - 10.11; Windows XP - 10; and the latest version of Ubuntu. Every OS fits nicely on an its own 8GB drive. I do have a couple of 16GB with apps. For example on the one for OS X, it has iLife 11, iWork 09, and Carbon Copy Cloner. Ever since I put all this on the keychain, it has really simplified setting up computers without having to spend a whole bunch of time looking for disks or remaking a CD/DVD/Bootable USB.

    I don't think 16GB is really needed. If that is what you have and want to use, no worries. But without opening the whole can of worms, I would HIGHLY doubt the OS would grown more then a couple hundred MB.... let alone 1.3GB.

    keychain.jpeg
     
  19. mikeboss macrumors 65816

    mikeboss

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    Aug 13, 2009
    Location:
    switzerland
    #19
    haha, funny! almost like mine...

    IMG_0769.JPG
     
  20. Fishrrman macrumors G3

    Joined:
    Feb 20, 2009
    #20
    Question regarding OP's original post 1.

    Assuming I have the flash drive initialized, mounted and ready-to-go, where must the "Install OS X 10.11 Developer Beta" be located in order to have the terminal command execute properly?

    Can the installer file be on the desktop?
    Or must it be somewhere else?
    Or does it make no difference?
     
  21. BasicGreatGuy Contributor

    BasicGreatGuy

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    Sep 21, 2012
    Location:
    In the middle of several books.
    #21
    Usually, it is in the Applications folder. You can also use DiskMaker X to create the bootable USB.
     
  22. mmcxiiad thread starter macrumors 6502

    Joined:
    Jul 19, 2002
    #22
    I updated the first post to address this. Unless you alter the terminal command, the installer MUST BE IN THE MAIN APPLICATIONS FOLDER.
     
  23. nfl46 macrumors 603

    Joined:
    Oct 5, 2008
    #23
    This is what I did.
     
  24. Fishrrman macrumors G3

    Joined:
    Feb 20, 2009
    #24
    In re my post #20 above:

    I placed my copy of the "Install OS X 10.11 Developer Beta" installer into the Applications folder, and then ran the terminal command in post 1.

    Terminal puts up the following error message:
    sudo: /Applications/Install OS X 10.11 Developer Beta.app/Contents/Resources/createinstallmedia: command not found

    Any ideas as to what I did wrong?
     
  25. dsemf macrumors regular

    Joined:
    Jul 26, 2014
    #25
    Either put the command in quotes or escape the spaces using a back slash.

    DS
     

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