How do I burn an ISO on a USB drive on Mac OS X?

what's the best way to get an ISO "burned" to a USB stick on a Mac? Restoring using Disk Utility does not work.

The ISO is ubuntu mini.iso. It is the minimalist install ISO for installing ubuntu. It needs to be bootable on a PC. I am trying to install ubuntu on a PC that has no CD-ROM. The only other computer I have around is a macbook.

Directly from the How to install Ubuntu on MacBook using USB Stick page (my formatting):

1. Download the desired file
2. Open the Terminal (in /Applications/Utilities/ or query Terminal in Spotlight)
3. Convert the .iso file to .img using the convert option of hdiutil (e.g., hdiutil convert -format UDRW -o ~/path/to/target.img ~/path/to/ubuntu.iso)
4. Note: OS X tends to put the .dmg ending on the output file automatically. Remove the .dmg extension as necessary, mv ~/path/to/target.img{.dmg,}
5. Run diskutil list to get the current list of devices
6. Insert your flash media
7. Run diskutil list again and determine the device node assigned to your flash media (e.g. /dev/disk2)
8. Run diskutil unmountDisk /dev/diskN (replace N with the disk number from the last command; in the previous example, N would be 2)
9. Execute sudo dd if=/path/to/downloaded.img of=/dev/rdiskN bs=1m (replace /path/to/downloaded.img with the path where the image file is located; for example, ./ubuntu.img or ./ubuntu.dmg).
10. Using /dev/rdisk instead of /dev/disk may be faster.
    • If you see the error dd: Invalid number '1m', you are using GNU dd. Use the same command but replace bs=1m with bs=1M.
    • If you see the error dd: /dev/diskN: Resource busy, make sure the disk is not in use. Start Disk Utility.app and unmount (don't eject) the drive.
11. Run diskutil eject /dev/diskN and remove your flash media when the command completes
12. Restart your Mac and hold down Alt while the Mac is restarting to choose the USB stick

Note: On newer Macs you might have to install an EFI boot manager to boot from USB.

See also: Download Ubuntu Desktop.

I had a very similar problem that none of these answered.

It's worth checking out UNetbootin. It will create a bootable USB disk on a Mac for a PC.

There is no need to convert the ISO to an IMG. I wasn't willing to convert an image first. This has easier steps, outlined below.

Start by listing the current disks and volumes:

diskutil list

Now unmount the current volume for the disk you are about to overwrite. (X = Drive number, in my case was 1):

diskutil unmountDisk /dev/diskX

Now dd the iso directly to the usb (again replace X with drive number of your USB drive):

sudo dd if=/pathto/mini.iso of=/dev/diskX bs=1m

Done!