% diskutil list
/dev/disk0 (internal, physical):
#: TYPE NAME SIZE IDENTIFIER
0: GUID_partition_scheme *500.3 GB disk0
1: EFI EFI 209.7 MB disk0s1
2: Apple_CoreStorage Macintosh HD 499.4 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
7ABE4445-B15B-49C3-9CEE-0D2859B0BE0A
Unencrypted
/dev/disk3 (external, physical):
#: TYPE NAME SIZE IDENTIFIER
0: Apple_partition_scheme *3.9 GB disk3
1: Apple_partition_map 32.3 KB disk3s1
2: Apple_HFS Arch 3.7 GB disk3s3
% diskutil unmountDisk /dev/disk3
Unmount of all volumes on disk3 was successful
% sudo dd if=/Users/ymotongpoo/Downloads/archlinux-2017.10.01-x86_64.iso of=/dev/rdisk3 bs=1m
Password:
523+0 records in
523+0 records out
548405248 bytes transferred in 193.278255 secs (2837387 bytes/sec)