Burn bootable ISO file into U-Disk in Mac OSX Yosemite

1 Open DiskUtil and format your u-disk with FAT format

2 Open Terminal, run diskutil list, you’ll get following output:

$diskutil list
   #:                       TYPE NAME                    SIZE       IDENTIFIER
   0:      GUID_partition_scheme                        *500.3 GB   disk0
   1:                        EFI EFI                     209.7 MB   disk0s1
   2:       Microsoft Basic Data BOOTCAMP                100.0 GB   disk0s2
   3:       Microsoft Basic Data DATA                    250.3 GB   disk0s3
   4:                  Apple_HFS Mac                     149.0 GB   disk0s4
   5:                 Apple_Boot Recovery HD             650.0 MB   disk0s5
   #:                       TYPE NAME                    SIZE       IDENTIFIER
   0:     FDisk_partition_scheme                        *7.7 GB     disk1
   1:                 DOS_FAT_32 UNTITLED 1              7.7 GB     disk1s1

So remember the disk position of your u-disk, as in the example above, it’s /dev/disk1

3 Run following command in terminal:

sudo dd if=/Users/unieagle/Downloads/Windows10_TechnicalPreview_x64_ZH-CN_9926.iso of=/dev/disk1 bs=8192

You can drag your iso file into terminal after input sudo dd if=, it will fill the path of iso file for u automatically.

4 Wait about 40′, and u will get the info in terminal:

532494+1 records in
532494+1 records out
4362192896 bytes transferred in 3034.644407 secs (1437464 bytes/sec)

This indicate success. So enjoy your bootable u-disk from ISO file.

If you got error message dd: /dev/disk1: Resource busy in the step 3, try to UNMount your udisk partition in DiskUtil and redo step 3.