I used TransMac on Windows 7 to restore the image file I had to the Flash Drive, it created a bootable Mac image on my flash drive. Dryden's Link, I was able to use the Diskpart command to clean and prep a GPT partition on a flash drive for an OSX Mavericks install image.

I was never able to write a Mac installer image to my Flash Drive and have it bootable, unless I did it on a Mac. If the correctly setup ThumbDrive doesn't work, your going to have to buy or borrow a Apple external SuperDrive.I know this question is old but it is still valid. Note: When your done, you will need to re-format the ThumbDrive as FAT32, because after doing those steps you'll have it formatted as NTFS. Just restart your Mac and hold 'Option' while booting. On your ThumbDrive browse to '/sources/', hold down 'Shift' and delete 'ei.cfg'Ĭongratulations, you should now have a Windows 7 Setup drive that boots on any computer.Copy ALL the files from the Windows 7 ISO to your ThumbDrive.format fs=NTFS label='W7_SETUP' quick override.create partition primary align=4096 (the align part is important for flash memory).clean (this will completely erase the ThumbDrive).select disk # (where # = your flash drive).list disk (make note of which disk is your flash drive).Right click 'cmd' and choose 'Run as a Administrator'.Mount your Windows 7 ISO to the Windows 7 Virtual Machine.Mount/Attach the USB ThumbDrive to your Windows 7 Virtual Machine.You said you have Windows 7 installed in a VM, so I've included the steps you need to take below: The easiest way to do this is to Re-Partition and then Re-Format the drive on Windows. In order to boot Windows setup the ThumbDrive has to have a Windows MBR and VBR (Master Boot Record/Volume Boot Record).

Create mac os usb in windows