Copy img to usb on Mac OS X

console.log

 ~ diskutil list
/dev/disk0
   #:                       TYPE NAME                    SIZE       IDENTIFIER
   0:      GUID_partition_scheme                        *121.3 GB   disk0
   1:                        EFI EFI                     209.7 MB   disk0s1
   2:          Apple_CoreStorage                         120.5 GB   disk0s2
   3:                 Apple_Boot Recovery HD             650.1 MB   disk0s3
/dev/disk1
   #:                       TYPE NAME                    SIZE       IDENTIFIER
   0:                  Apple_HFS Macintosh HD           *120.1 GB   disk1
                                 Logical Volume on disk0s2
                                 06991E42-B94A-4A5A-BBF2-CDD355447A51
                                 Unlocked Encrypted
/dev/disk2
   #:                       TYPE NAME                    SIZE       IDENTIFIER
   0:     FDisk_partition_scheme                        *7.8 GB     disk2
   1:                    FreeBSD                         293.6 MB   disk2s4
 ~ diskutil unmountDisk /dev/disk2
Unmount of all volumes on disk2 was successful
 ~ sudo dd if=/Users/gvincent/Downloads/FreeBSD-10.1-RELEASE-amd64-memstick.img of=/dev/rdisk2 bs=64k