1. Convert opensuse installtion ios to dmg

1

hdiutil convert -format UDRW -o opensuse-13.01.img opensuse-13.01.iso

1. Get the current device lists

1

diskutil list

Remeber the current existing device number

1. Insert USB

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diskutil list 

again and find the device node assigned to your usb ( e.g. /dev/disk1)

1. Unmount your USB

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diskutil unmountDisk /dev/disk1

1. Burn the flash

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sudo dd if=/your_img_location/opensuse-13.01.img of=/dev/rdisk1 bs=1m

1. Ignore the pop-up window and run

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diskutil eject /dev/disk1

1. Enjory it