Many times you have to create a bootable usb stick on a mac. I always follow the instructions at How to create a bootable USB stick on OS X. I created a quick bash script that makes this process faster
###!/bin/bash
HELP_STR="please provide location of .iso"
if [ "$#" -lt 1 ]; then
echo $HELP_STR
else
echo "`diskutil list`"
echo "==============="
echo "enter disk to eject, e.g., /dev/disk1"
echo -e ">> \c"
read word
echo "ejecting: \"$word\""
diskutil unmountDisk "$word"
echo "copying "$1" to "$word" note this may take a while and there wont be a progress bar"
sudo dd if="$1" of="$word" bs=1m
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