Creating USB flash drive from OS X did break my USB drive

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http://askubuntu.com – I downloaded Ubuntu .iso file from ubuntu.com and wanted to make a bootable USB stick from my MacBook Pro, I use OS X 10.8 (Mountain Lion) I followed those instructions: http://www.ubuntu.com/download/help/create-a-usb-stick-on-mac-osx When I did do the "sudo dd if=/path/to/downloaded.img of=/dev/rdiskN bs=1m" command, in 88 seconds it said "The disk you inserted was not readable by this computer." where I see "Initialize...", "Ignore" and "Eject" buttons and the Terminal gave me following message: 694+1 records in 694+1 records out 728018944 bytes transferred in 88.467946 secs (8229183 bytes/ (HowTos)