mac 将iso写入usb

1、查看U盘标识

liaojie@lj-mac-pro:~$diskutil list
/dev/disk0 (internal, physical):
   #:                       TYPE NAME                    SIZE       IDENTIFIER
   0:      GUID_partition_scheme                        *251.0 GB   disk0
   1:                        EFI EFI                     209.7 MB   disk0s1
   2:                 Apple_APFS Container disk1         250.8 GB   disk0s2

/dev/disk1 (synthesized):
   #:                       TYPE NAME                    SIZE       IDENTIFIER
   0:      APFS Container Scheme -                      +250.8 GB   disk1
                                 Physical Store disk0s2
   1:                APFS Volume Macintosh HD            216.1 GB   disk1s1
   2:                APFS Volume Preboot                 22.1 MB    disk1s2
   3:                APFS Volume Recovery                509.8 MB   disk1s3
   4:                APFS Volume VM                      3.2 GB     disk1s4

/dev/disk2 (external, physical):
   #:                       TYPE NAME                    SIZE       IDENTIFIER
   0:     FDisk_partition_scheme                        *15.9 GB    disk2
   1:             Windows_FAT_32                         15.9 GB    disk2s4

liaojie@lj-mac-pro:~$diskutil unmountDisk /dev/disk2
Unmount of all volumes on disk2 was successful
liaojie@lj-mac-pro:

2、将iso写入到usb

liaojie@lj-mac-pro:~$sudo dd if=/Users/liaojie/tmp/soft/CentOS-6.8-x86_64-bin-DVD1.iso of=/dev/disk2 bs=1m
Password:
3735+0 records in
3735+0 records out
3916431360 bytes transferred in 179.743862 secs (21788957 bytes/sec)
liaojie@lj-mac-pro:~$