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I have a MacBook and I'd like to install Windows 7 via USB. I've created the partition using Boot Camp and I've got an .ISO of my Windows 7 install disk. Is it possible to install this via USB, instead of burning a DVD?

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4 Answers 4

up vote 14 down vote accepted

Through Disk Utility you can restore the Windows 7 ISO onto the flash drive.
When you hold option at startup to access the boot options the disc will appear.

Note: When you do the restore through Disk Utlity make sure your flash drive is partitioned correctly.

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It needs to be partitioned as Mac OS X journaled (HFS+) - this will enable the GUID partition map (so the boot menu can read the ISO). Next, click source and within the finder locate the ISO and you're set.

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10  
This doesn't work for me. I'm partitioning my disk with 1 partition as 'Max OS Extended (Journaled)', but when I try to select the ISO in the Source: field, the iso file is greyed out by Finder, and attempting to do it by drag-and-drop gives 'Could not validate source - Invalid argument'. Also, I'm on Mac OS X Mountain Lion. –  JeremyKun Jul 16 '12 at 4:39

With Lion, Apple has added an option to BootCamp that will create a bootable USB Windows 7 install disk, this option is only enabled in Mac models which don't have an optical drive. To enable this option just follow this guide.

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Welcome to Super User! Whilst this may theoretically answer the question, it would be preferable to include the essential parts of the answer here, and provide the link for reference. –  slhck May 23 '12 at 7:41
    
Thanks for the comment! I'll take it into consideration for my following answers. –  Aviel Jun 10 '12 at 12:43
    
exactly what i was looking for! Thank you. –  Duke Dec 3 '12 at 4:23
    
I don't know if it's a Mountain Lion thing, but I cannot modify the plist file. Even sudo won't cut it as the file is "locked". –  Maciej Trybiło May 18 '13 at 19:16

This worked for me:

Burn ISO to bootable USB flash drive in Mac OSX terminal (via command line Diskutil)

  • Convert the .iso file to .img using the convert option of hdiutil (e.g., hdiutil convert -format UDRW -o ~/path/to/target.img ~/path/to/ubuntu.iso)
  • Note: OS X tends to put the .dmg ending on the output file automatically.
  • Run diskutil list to get the current list of devices
  • Insert your flash media
  • Run diskutil list again and determine the device node assigned to your flash media (e.g. /dev/disk2)
  • Run diskutil unmountDisk /dev/diskN (replace N with the disk number from the last command; in the previous example, N would be 2)
  • Execute sudo dd if=/path/to/downloaded.img of=/dev/rdiskN bs=1m (replace N with your disk number)
  • Run diskutil eject /dev/diskN and remove your flash media when the command completes
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Make sure to run the Bootcamp assistant before you try to boot off the flash drive. Follow the instructions in How to install Windows 7 from USB, then see if the computer will recognize the flash drive when you boot up. To choose different boot media when a Mac starts, press Option, then select the flash drive if it appears.

If that doesn't work, post in the comments; there may be more steps required to get it to boot off of the external drive.

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