Use mintStick in Linux Mint.

mintStick is installed by default in Linux Mint.
Launch "USB Image Writer" from the menu, select your ISO image and your USB device and press "Write to device".

Using the Terminal

It is really simple. Go to a Terminal and type:
 

sudo dd if=~/Desktop/linuxmint.iso of=/dev/sdx oflag=direct  bs=1048576

 

Where '~/Desktop/linuxmint.iso' is the name and location of your downloaded image (located at the desktop in this example) and '/dev/sdx' is the target USB drive. If your system doesn't support 'oflag=direct', you can just leave it out as it is simply intended to speed up the process a bit.

If you don't know about the target USB drive path, run this command and figure out your destination drive.

sudo fdisk -l

 

Warning: Make sure to set the correct device path, as this process will delete all data that was on the specified device previously!

Remember, don't include an integer for the USB drive, e.g. '/dev/sdx1', as it would refer to the existing partition on that drive and not the drive itself.

When the USB has been properly created by 'dd', there should be an output similar to this:

sudo dd if=~/Desktop/linuxmint.iso of=/dev/sdb oflag=direct bs=1048576
706+1 records in
706+1 records out
740601856 bytes (741 MB) copied, 91.7024 s, 8.1 MB/s

Installing Linux to USB drive

UNetbootin - Installing Linux using a pen drive (bootable USB)

You want to install Linux on a machine and you don't have any CD or DVD to burn the image file! You can make use UNetbootin.
This small software available for Windows, Linux and Mac allows you to create bootable drive containing a full Linux distribution (installer) or any ISO.
For Linux users, enter the following command:

• Fedora:

  ~$ sudo yum install unetbootin  

• Debian or Ubuntu:

  ~$ sudo apt-get install unetbootin  

Then enter the following command, as root:

• ~$ sudo unetbootin

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