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Create bootable Windows 7 USB with Mac using Disk Utility

I've done this before but can't remember how.  I've tried different variations using the "restore" function within Disk Utility but I keep receiving the error could not validate source error - 254.

The image I'm attempting to use is .iso.  Again, I have completed this before with this system but I don't remember what I had to do in order to make it happen.  Thanks in advance.

My OS 10.7.5
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1namylnAuthor Commented:
I've seen that.  Problem is its all command line and I know I've completed this task without having to use Terminal.
Ricardo MartínezInformation SecurityCommented:
Sorry but i can't find more references for that specific software and i don't have a mac to try. Hope you can find the solution or else, try doing it with the terminal like specified in the previous link i posted.
Eoin OSullivanConsultantCommented:
@1namyln - In order to make a USB drive bootable for Windows it needs to have a Windows MBR and VBR (Master Boot Record/Volume Boot Record).
You cannot use Disk Utility to create a Windows Bootable USB drive you can use the OSX program Boot Camp Assistant (located in Application:Utilities) which can prepare the USB drive to install a Windows ISO, download Windows drivers for OSX etc.
1namylnAuthor Commented:
I remember that I could not in fact get this to work within Disk Utility.  I had to use the below tool.

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