Burn a ISO file to USB

first open a terminal window and search for the usb stick:

diskutil list

You get a inforation like this:

/dev/disk0 (internal):
   #:                       TYPE NAME                    SIZE       IDENTIFIER
   0:      GUID_partition_scheme                         500.3 GB   disk0
   1:                        EFI EFI                     314.6 MB   disk0s1
   2:          Apple_CoreStorage Macintosh HD            499.3 GB   disk0s2
   3:                 Apple_Boot Recovery HD             650.0 MB   disk0s3

/dev/disk1 (internal, virtual):
   #:                       TYPE NAME                    SIZE       IDENTIFIER
   0:                  Apple_HFS Macintosh HD           +499.0 GB   disk1
                                 Logical Volume on disk0s2
                                 E323C460-D745-4343-9D93-D557DDDF2639
                                 Unlocked Encrypted

This are the internal disk from my macbook pro. If you found your USB stick - e.g.

/dev/disk3 (external, physical):
   #:                       TYPE NAME                    SIZE       IDENTIFIER
   0:     FDisk_partition_scheme                        *8.2 GB     disk3
   1:                 DOS_FAT_32 UNTITLED                8.2 GB     disk3s1

you first unmount the stick with

diskutil umountDisk /dev/disk3

Return message:

Unmount of all volumes on disk3 was successful

Now change in the directory where your *.iso file is located and use this command to write it to the usb stick

sudo dd if=<filename>.iso of=/dev/r<disk> bs=64k

Example:

nbmac4:mint js$ sudo dd if=linuxmint-18.1-xfce-32bit.iso of=/dev/rdisk3 bs=64k
Password:
25488+0 records in
25488+0 records out
1670381568 bytes transferred in 282.185942 secs (5919436 bytes/sec)

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