How to boot rMBP from external disc?

Discussion in 'MacBook Pro' started by aware, Dec 12, 2012.

  1. simsaladimbamba

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    #2
  2. aware thread starter macrumors member

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    Nov 23, 2012
    #3
    Hi, i tried but rMBP only shows the option of boot from hd and boot from recovery. It does not show the external drive?
     
  3. simsaladimbamba

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    #4
    What is on the disc in the external drive then?
     
  4. aware thread starter macrumors member

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  5. simsaladimbamba

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    #6
    How did you burn the DMG? DMG files are not bootable, thus just burning the DMG as a file to a CD or DVD will not work getting a bootable disc.

    Steps 7 and following should help you getting a bootable DVD: How To Make Copies of DVDs
     
  6. aware thread starter macrumors member

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    Nov 23, 2012
    #7
    Hi, there are some steps i don't understand. Step 3 ask us to create new image from disc, the pic shown is for dvd but mine is downloaded dmg file. Should i create a new image from dmg? If i create a new image, what format and partitions should i choose?
     

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  7. simsaladimbamba

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    #8
    That is why I mentioned, that step 7 and following are the steps helping in your case. Maybe I should have clarified, that steps 1 to 6 can be ignored.
     
  8. aware thread starter macrumors member

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    Nov 23, 2012
    #9
    Step 7 ask us to select a DVD disk image (.cdr) from column list on the left of the Disk Utility window, but mine is a dmg image. So i just burn dmg or do i need to convert to cdr?
     
  9. simsaladimbamba

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    #10
    Further into that sentence it also teils you can Open an external image, it does not need to be a DMG.
     
  10. aware thread starter macrumors member

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    #11
    Sorry but i don't understand, what external image? I only got dmg file.
     
  11. Jedi macrumors regular

    Jedi

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    Apr 28, 2008
    #12
    Hi ,

    I too have a question , maybe someone would help. :

    So when you extract the “InstallESD.dmg” , then copy > then paste to "Source"
    to make it bootable ( USB Flash Drive ).

    Now is where I get confused , I have not done any of this yet , but buying any Mac and not "optimizing" it seems like a waste __ IMO.

    So , now I have my USB F/D at the ready and my computer is OFF ( I go grab a cup-of-joe ) , then I plug the USB f/d into a USB port.

    Here is where I`m stuck !! , I know stupid me :eek: , but what keys do I press to allow the USB drive to boot ?

    If I did this I would need to get back to disc utilities to re-format the main drive and do a custom install.

    Any and all help would be greatly appreciated , thanks in advance.

    In the "old days" you could just but your install disc in and hold the "C" key,
    then go to D-U to reformat and clean install.

    Take care , Happy Holidays :D

    Gary 
     
  12. simsaladimbamba

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    #13
    The OPTION key.

    The DMG is an image, a Disk ImaGe, that is the one you select.
     
  13. Jedi macrumors regular

    Jedi

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