1.download Kali Linux iso images from http://www.kali.org/downloads/
2. Format the usb stick in disk utility as msdos
3. Open Terminal Window and run the following
Code:
diskutil list
The result is
Code:
/dev/disk0
   #:                       TYPE NAME                    SIZE       IDENTIFIER
   0:      GUID_partition_scheme                        *251.0 GB   disk0
   1:                        EFI                         209.7 MB   disk0s1
   2:                  Apple_HFS Macintosh HD            250.1 GB   disk0s2
   3:                 Apple_Boot Recovery HD             650.0 MB   disk0s3
/dev/disk1
   #:                       TYPE NAME                    SIZE       IDENTIFIER
   0:      GUID_partition_scheme                        *8.0 GB     disk1
   1:                        EFI                         209.7 MB   disk1s1
   2:       Microsoft Basic Data KALILINUX               7.7 GB     disk1s2
4. my USB device is /dev/disk1, Then unmount disk by diskutil command
Code:
 diskutil umountDisk /dev/disk1
The result is
Code:
Unmount of all volumes on disk1 was successful
5. You may have to run this as sudo
Code:
sudo dd if=kalilinux.iso of=/dev/disk1 bs=512 conv=noerror,sync
Waiting for complete
When It success
Code:
4288416+0 records in
4288416+0 records out
2195668992 bytes transferred in 1763.590690 secs (1244999 bytes/sec)
Enjoy!!