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I copied my windows 7 cd to a ISO and trying to source the image onto my USB drive from OSX. So far it doesn't seem like it's possible with disk utility. Is there something else I can do to make this work?

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Of course, the command line is always there to help.

  • Insert the USB flash drive and run the command diskutil list to find out the disk name, we'll use /dev/disk1 as an example.

  • Now unmount the disk using diskutil unmountDisk /dev/disk1

  • Now we are ready to copy the ISO to the device:

dd if=/path/to/Win7.iso of=/dev/disk1 bs=8192
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  • Awesome, I'll try this thank you. How do I mount it though? I think you missed that... I might be confused on terminology. Don't you have to mount to copy it? Also what about NTFS?
    – Daniel Fischer
    Feb 12, 2011 at 3:03
  • If the disk is preformatted as NTFS it should still be able to read/write to it. You do not have to mount it as you are writing to the device.
    – user1931
    Feb 12, 2011 at 4:07
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    Does not create a bootable USB drive. Wasted 2 hours of my night.
    – Meekohi
    Mar 14, 2013 at 4:03
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    Not bootable for PC nor for Mac
    – Pierre de LESPINAY
    Apr 25, 2015 at 18:18
  • Not bootable when performed with OSX 10.15.3
    – norman_h
    Feb 29, 2020 at 21:17

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