Search for Simplicity: Make a Bootable USB from a DMG

Wednesday, August 27, 2008

Make a Bootable USB from a DMG

Here's the simplest process I have seen...

Mount a bootable DMG image so it appears in /Volumes (eg. /Volumes/SomeAppDisk)

Stick in a USB Key you don't mind erasing (eg. /Volumes/USBToBeWiped )

From a terminal type
sudo asr --restore --source /Volumes/SomeAppDisk --target /Volumes/USBToBeWiped --erase

wait ....10....20....30....40....50....60....70....80....90....100

Note: --erase will cause the usb key to be wiped AND is what 'bless'es the device so it becomes bootable.

There you go..

4 comments:

MacPhreak said...: You need to mention or people need to know a few things. You cannot use the Install MAc OSX from the install disc or use the startup disc. The only way it will boot is using the "Option" on startup. Other than that it works great. In fact i just used it on my External Firewire drive; 8:52 PM, September 02, 2009
David said...: Does this work with .iso files as well?; 3:36 PM, October 21, 2009
Nigel said...: Sorry David, not to my knowledge. No.; 9:21 PM, October 28, 2009
dkliman said...: @david I did use disk utility to save an iso file as a DMG, and the rest worked fine.

Here's the instructions:

http://macosx.com/forums/1493290-post4.html; 12:35 AM, January 28, 2010

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