[Assass1n]

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"

[Elvandil]

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?

[Squashman]

What seems to be the Login issue?

[Headrush]

Convert the DMG to an ISO and burn.

http://www.winytips.com/burn-dmg-file-on-windows-pc/

[tompatrick]

More Help
http://www.howtogeek.com/102983/how-...es-on-windows/

[Headrush]

Originally Posted by tompatrick

More Help
http://www.howtogeek.com/102983/how-...es-on-windows/

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.

[Assass1n]

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

[Assass1n]

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

[Headrush]

Originally Posted by Assass1n

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?

[sokratus]

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)?

[sokratus]

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.