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


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Assass1n's Avatar
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31-Jul-2012, 11:46 PM #1
Making a bootable USB for Mac OS X Mountain lion on Windows 7
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"
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01-Aug-2012, 12:49 AM #2
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?
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01-Aug-2012, 09:38 AM #3
What seems to be the Login issue?
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01-Aug-2012, 06:29 PM #4
Convert the DMG to an ISO and burn.

http://www.winytips.com/burn-dmg-file-on-windows-pc/
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02-Aug-2012, 11:33 PM #5
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03-Aug-2012, 06:39 AM #6
Quote:
Originally Posted by tompatrick View Post
LOL, the link I posted also used DMG2IMG, the difference being you don't have to use it through a command line.

Just try to open the DMG and when it asks which program to use, point to DMG2IMG.
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06-Aug-2012, 08:16 PM #7
When I try open it using UltraISO I get "Invalid or unknown image file format"
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06-Aug-2012, 08:20 PM #8
Tried using the DMG2IMG program but all that happens is that it makes a IMG file that is 0 KB....
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06-Aug-2012, 09:25 PM #9
Quote:
Originally Posted by Assass1n View Post
Tried using the DMG2IMG program but all that happens is that it makes a IMG file that is 0 KB....
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?
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07-Aug-2012, 12:24 AM #10
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)?
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12-Aug-2012, 01:57 AM #11
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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