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Making a bootable USB for Mac OS X Mountain lion on Windows 7

Discussion in 'Apple Mac' started by Assass1n, Jul 31, 2012.

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  1. Assass1n

    Assass1n Thread Starter

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    I'm trying to make a bootable USB for Mac OS X Mountain lion on Windows 7.

    My Macbook has OS X Lion on it but something happened to it and I can't log in therefore I've been using Windows 7 on it via Bootcamp.

    Is there a way to make the bootable USB on Windows 7?

    I've already got the Mountain Lion DMG but I've tried numerous methods to open it such as using PowerISO but I get the message "The file format is invalid or unsupported"
     
  2. Elvandil

    Elvandil

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    DMG is not a Windows image format, though some Windows programs can handle them.

    But just opening the image and copying to USB will not make a bootable USB. It needs a boot sector installed, too. Do you have directions on how to accomplish what you are doing?
     
  3. Squashman

    Squashman Trusted Advisor

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    What seems to be the Login issue?
     
  4. Headrush

    Headrush

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  5. tompatrick

    tompatrick

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  6. Headrush

    Headrush

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  7. Assass1n

    Assass1n Thread Starter

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    When I try open it using UltraISO I get "Invalid or unknown image file format"
     
  8. Assass1n

    Assass1n Thread Starter

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    Tried using the DMG2IMG program but all that happens is that it makes a IMG file that is 0 KB....
     
  9. Headrush

    Headrush

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    Did you drop the DMG file onto the DMG2IMG program?

    I just tried it and it worked OK.

    P.S. I overlooked that part where you mentioned you where trying to put this on a USB stick.
    Does you MacBook have an optical drive?
     
  10. sokratus

    sokratus

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    I am having the same problem. I was upgrading to OS X Mountain Lion from Lion, but something happened and my computer is now stuck at gray screen apple logo spinning wheel. I can surely enter in the recovery mode but I dont want to delete anything or lose my data. Now I have other windows computer on which I have downloaded the OS X Lion and I was kinda hoping that I can create a bootable disk on my windows for my macbook, so that I can re-install lion. Now I just downloaded the DMG2IMG software and looking online it suggests that I can convert the DMG to ISO, but how will that help in creating a bootable disk or USB (most preferably USB)?
     
  11. sokratus

    sokratus

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    I got my problem fixed. I downloaded vmware image of Lion on windows. Created a bootable USB of Lion over there. Installed Lion on my mac and mac started to work. Then I created bootable USB on mac for mountain lion. Now everything is working fine.
     
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