Here is a handy list of commands using macosx native diskutil command. In my case for creating a USB image of Moblin v 2.0 for my atom powered Acer Aspire One Z5. $ diskutil list $ diskutil unmountDisk /dev/diskN $ sudo dd if=/path/to/downloaded.img of=/dev/diskN bs=1024 angel:Netbook atma$ sudo dd if=moblin-2.0-final-20090924-001.img of=/dev/disk4 Password: 1476608+0 records in 1476608+0 records out 756023296 bytes transferred in 1924.583704 secs (392824 bytes/sec) $ diskutil eject /dev/diskN O More