And you will get information as follow:
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| #: TYPE NAME SIZE IDENTIFIER
0: GUID_partition_scheme *251.0 GB disk0
1: EFI EFI 209.7 MB disk0s1
2: Apple_CoreStorage Macintosh HD 250.1 GB disk0s2
3: Apple_Boot Recovery HD 650.0 MB disk0s3
/dev/disk1 (internal, virtual):
#: TYPE NAME SIZE IDENTIFIER
0: Apple_HFS Macintosh HD +249.8 GB disk1
Logical Volume on disk0s2
AFC412BE-25DE-4B96-A918-783799BD0D95
Unlocked Encrypted
/dev/disk2 (disk image):
#: TYPE NAME SIZE IDENTIFIER
0: Apple_partition_scheme +17.4 MB disk2
1: Apple_partition_map 32.3 KB disk2s1
2: Apple_HFS Flash Player 17.4 MB disk2s2
/dev/disk4 (external, physical):
#: TYPE NAME SIZE IDENTIFIER
0: FDisk_partition_scheme *8.0 GB disk4
1: DOS_FAT_32 8.0 GB disk4s4
```
* Get the information of flash disk and unmount it.
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diskutil unmountDisk /dev/disk4
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| Then we will get the information as follow:
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Unmount of all volumes on disk4 was successful
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* Write ios file in USB flash disk
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sudo dd if=~/Downloads/ubuntu-14.04.3-desktop-amd64.iso of=/dev/disk4 bs=4m
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| Wait for a while, the Startup Disk will be created.
## Make MacOS Startup Disk
* Launch diskutil. Format USB flash disk with OSX Extended, and named the disk, like Capitan.
* Write the image to USB flash disk with command:
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sudo /Applications/Install\ OS\ X\ 10.11\ Developer\ Beta.app/Contents/Resources/createinstallmedia –volume /Volumes/Capitan –applicationpath /Applications/Install\ OS\ X\ 10.11\ Developer\ Beta.app –nointeraction
Notice: the USB flash name & OS image file maybe different.
[OS X 10.11 El Capitan U盘制作 OS X 10.11下载](http://www.pc6.com/edu/80319.html)