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I am trying to install ubuntu onto my flash drive using the instructions from the website, http://www.ubuntu.com/download/help/create-a-usb-stick-on-mac-osx , and after step 8, the terminal asks for my password, which it accepts and then pops u this error message, dd: /dev/rdisk1bs=1m: Operation not supported. I have also tried making the last m in that statement capital and then the system does not ask me for my password but the error message still pops up. What is happening and why?

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There should be a space between /dev/rdisk1 and bs. If that's not the typo you've done while issuing that dd but only here, you can edit your question so that no confusion arise. –  Samik Jul 3 '12 at 10:55
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7 Answers 7

If you unmount instead of eject you will be able to then run the command successfully.

This can be done in Apple's Disk Utility using the Unmount button (in toolbar next to Eject), or it can be done as Marcel answers below from the commandline.

sudo diskutil unmountDisk /dev/diskN
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Welcome to AskUbuntu. It would be helpful to OP if you can explain your answer in more details. –  JackLock Jun 25 '13 at 18:21
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If the above does not help (as it did for me), try

sudo diskutil umountDisk /dev/diskN

That did the trick for me.

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Some explanation? –  Joren Oct 7 '13 at 14:24
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If the disk is still mounted, you'll get a 'resource busy' error. If it's been ejected, you'll get the 'Operation not supported' error. You need to go into disk utility and UNMOUNT the partitions on the drive but do not EJECT the destination drive. Hope this helps as it can get kinda frustrating and the errors aren't always particularly helpful.

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I've also had a similar problem while using the correct syntax (i.e. dd bs=1m if=source.img of=/dev/rdisk1).

A reboot seemed to fix my issue, despite several attempts with a command that had worked previously while restoring a different image.

Hope this helps!

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i had to unmount then run: sudo dd if=image.img of=/dev/disk1s1 bs=512k

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The correct command is sudo dd if=/path/to/downloaded.img of=/dev/rdiskN bs=1m (Replacing N with the disk number you found by running diskutil list)

The space between rdiskN and bs=1m is not clear in the guide because of the way the text wraps.

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of=/dev/rdiskN bs=1m

I didnt realize my first time that the N is still a variable for the disk number you found when running diskutil list

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