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  1. Tried this and it all completed fine. But when i stuck the USB drive into a new machine to install windows 7 from it onto a new drive , got this message “”DISK BOOT FAILURE, INSERT SYSTEM DISK AND PRESS ENTER.” I have changed by BIOS settings to boot from USB first.

    Trying to create a DVD from the iso now to see if that works..

  2. Hi there,
    every time I tried it I got this: “dd: /dev/disk1: Resource busy”
    What could be the reason?
    I’ve mounted and unmonted the pen drive several times.
    Thanks

    • Hi there.

      Usually this indicates that the disk is in use somehow.

      Try this:

      Open Disk Utility, unmount any of the individual partitions on the pen drive but do not eject the pen drive itself.

      Now right click on the pen drive in Disk Utility and note the identifier from the information tab.

      Now go back to terminal and use the following:

      dd if=’your iso image’ of=/dev/’your identifier’ bs=1m

  3. thanx for the quick answer but when I checked the Disk Utility there are no individual partitions to unmount on the pen… quite strange.
    Any ideias?
    Thanx again

  4. sir i have made bootable usb drive. but i want to know that how can i install windows xp on mac with it. because by dvd is finished.

  5. I got it copy all the file from ISO to my 4 G drive, no error , but when i option boot from Mac it didn’t show up at all,
    how do i make it boot from Mac…..

  6. I’m a quasi-geek guy. I have several Linux machines and don’t mind using terminal. I tried this method to burn yellow dog to DVD (instead of thumb drive) to convert an old G5 to YDL. I get an error message telling me I don’t have permission! Any idea what went wrong?

    Great site. Thanks for your help and insights.

    • Hi John…I presume you’re using Mac to burn it?

      If so, simply use Disk Utility instead of terminal for a DVD.

      If you prefer command line, you should use a utility called cdrtools (formerly cdrecord).

  7. I did use option boot I only see systemdisk. The ISO file that I use can burn it to CD and boot it from MAC using without problem.

    In detail this iso file is to setup WinPE to connect SCCM for bootcamp.

  8. I tried this, but when I enter the last command, the Terminal tells me “dd: /dev/disk2bs=1m: Permission Denied”.

    Any clue why this is happening and how to fix it?

    (I’m completely new to Terminal…)

    • Make sure you add “sudo” at the very beginning, and then when you get prompted for the password. Just to be clear: enter in your password (not another user, or root/admin user).

      Sudo gives you temporary administrative/root level access. Since OSX is based on BSD, which is based on Unix, the entire operating system has user and group permissions and ownerships. Sudo gives you the ultimate ownership by taking on the identity of the root/admin user, so use carefully.

      • still works with yosemite! nice to dig though the dust and cobwebs for little treasures to rebuild old systems.

      • This only works if the user is an admin, or is in the sudoers file, If they aren’t, they can’t use sudo, and MUST log in as an admin.

  9. Hey, your guide was really useful and i was able to get it working. How do you make the drive back into a normal usb flash drive ? i’ve tried formatting but it still reads as cd drive on my computers. Help ?

    • You’ll need to partition the drive again. Use Disk Utility, select the thumb drive, select Partition. In Volume Scheme, in the drop down, select 1. In Options, select what you intend to do with the drive and click Apply.

      Voila!

      • Thanks for the lightning fast response. i’ve only just tried this now and it works like a charm. Consider your website bookmarked 8)

        cheers

  10. ace thank you for this guide but i am stuck on my mac when i insert my hard drive it boots up as a cd but when i restart while pressing option only my macintosh and recovery drive was seen please help

    • Samuel, I have exactly the same problem. I just made a bootable usb drive using the command line above. But when I hold down the alt key it doesn’t show up (just the macintosh HD and recovery disk. Does anyone know how to fix this?
      great site though!
      regards

  11. I’m using an Acer Aspire One Netbook. I have complated these instructions on a MacbookPro.

    The Acer is not reading the bootable usb even after having changed the BIOS settings.

    I check to see the format of the USB and it is Mac OS extended, how do you complete the intsructions above but end up with a FAT usb?

    • You need to use Disk utility to make the partition into a FAT partition before you start. Also make sure under OPTIONS it is set to Master Boot Record.

      • For creating a bootable OS X install for a netbook, the drive needs to be partitioned as GUID, and formatted as HFS+ (Journaled), not MBR and FAT.

  12. After doing this to my usb, my usb does not show up when i plug it into my mac. is there a way to undo this?

  13. i type the code in with sudo dd if=
    it asks me for my password
    and then says operation not supported.. what should i do?

    • Hi Andy….this message occurs if you have not unmounted the drive. Try step 6 again and make sure you’re unmounting the correct drive before you try the dd command.

      • when i try to unmount it, terminal says: disk 2 was already unmounted or it has a partioning scheme so use “diskutil unmountDisk”

  14. hi,
    this is michael from Empowering The Blind,, and I have a question related to your above directions. I am running these commands on Mac OS X version 10.8.3 system, and I don’t know if these commands are still valid. See the terminal code posted below.

    michael $
    diskutil unmountdisk /dev/disk1

    Unmount of all volumes on disk1 was successful
    michael $
    dd if= iso.iso of= /dev/disk1

    dd: no value specified for if


    note:
    the iso file i’m using is in /user/michael/desktop/isos/ and i’m in this directory already.
    thanks for any help.
    michael

  15. 71 minutes?
    If you want to improve transfer speed, you have to use
    # dd if=your_image.iso of=/dev/rdiskN bs=1m

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  20. Just a quick note:
    DD will reformat the drive, destroying any partition scheme in the volume. If for whatever reason you need to maintain a given partition scheme, instead of using dd if=~/pathToFile.iso of=/Volumes/DiskX bm=1, one can specify the desired partition, e.g., dd if=~/pathToFile.iso of=/Volumes/Disk2s2 bm=1.
    Also if you are not in an admin account, one may need to use sudo, i.e., e.g., sudo dd if=~/pathToFile.iso of=/Volumes/Disk2s2 bm=1