OS X

Convert the ISO to a DMG file:

hdiutil convert -format UDRW -o /<path-to-output-img>/FireEye­CCCB-vx.x.x.img /<path-to-input-iso>/FireEye-CCCB­vx.x.x.iso

List your currently attached disks:

diskutil list

Insert your USB drive.

List your currently attached disks and identify the newly attached USB drive:

diskutil list

Unmount the USB drive:

diskutil unmountDisk /dev/diskX

Use dd to copy the image to the new USB drive, making sure to specify the USB drive as /dev/rdiskX instead of /dev/diskX:

sudo dd if=/path/to/input/dmg/FireEye-CC1-vx.x.x.img.dmg of=/dev/rdiskX bs=1m

Eject the USB drive:

diskutil eject /dev/diskX