Create bootable usb flash drive for Mac OS X Yosemite with own image

I am trying to create bootable media so I can image 20+ macs with an image that I created from another machine. The mac I used to create the image already has all the applications and settings I want to have on the other 20+ macs. I see all kinds of tutorials on creating bootable media for Yosemite. However, none that I can find, have instructions on using the image I have already created. Does anyone know of a way to do this efficiently?
natekelleyNetwork Engineer - Small Business SpecialistAsked:
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Use Carbon Copy Cloner ( ) to clone the drive to and external USB3 drive. This external will then be bootable.

You can then connect it to the Mac you want to clone to and boot from the external by holding down the option key. Then use CCC to clone the external to the new workstation.

CCC will do a live clone of a boot drive.

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natekelleyNetwork Engineer - Small Business SpecialistAuthor Commented:
From my current location I have a .dmg file in my possession that is 21GB. This is the image that I am working with. Would it be possible to use CCC with a dmg?

Also, will there be any issues with uniquely identifiable information from cloning?

Thank you very much for your fast response.
See this link re restoring from a disk image:
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I suggest that you use Migration Assistant instead.  It will be much faster.  Your macs should already have an OS on it so you don't need to "clone" that part of it.  You just need the apps, accounts and some settings.  If you migrate the settings, you will only have to set the system name afterwards to make it different.  If you also join a Windows AD, I would suggest doing that after you've done the migration and changing the computer name.

To make the image, boot into Recovery mode and install the OS onto your USB.  Then hold down the option key and select the USB device to boot.  Start the Migration assistant and select the Apps, accounts and settings that you want to copy.

Make sure you have a USB 3 device, or it will be slow.  You could also get yourself a Thunderbolt Cable and run the Migration assistant over that.  Hold the t key down on the source device into target mode and run Migration assistant in the destination machine to Migrate from the target disk.  I do this with laptops and a full 500 GB SSD takes less than 30 minutes.  An older laptop with a spinning disk takes a little over an hour to migrate to a laptop with a SSD.  A device with just a few apps (just a few gigs) usually takes less than 7 minutes total over Thunderbolt.
Justin BradshawOwnerCommented:
I'd split the difference between strung and serialband's suggestions. Use CarbonCopyCloner to create an external clone of your example machine and then use Migration assistant on the new computers to transfer the data. That's the easiest and fastest way to do what you're shooting for.
You should be able to use Disk Utility to "Restore" your 21 GB DMG onto the USB.  No need to purchase anything to do that.

Also with Migration assistant, you don't really need to make your USB bootable, if you've just copied the OS data you need to it and keep the folder locations and format.  If you have large or multiple user accounts, you can always skip that during the Migration Assistant and just copy the settings and Apps.  You could then use the command line rsync to copy the user account over to the other systems.

As an aside to the original problem of your USB, I suggest that you learn some basic unix command line for the macs.  You don't need to learn all of it, just the basics.  You can upgrade, patch, and install the majority of your applications remotely from the comfort of your own desk and save a lot of standing around and visiting each system to "clone" it.  I had a coworker that would spend a few days cloning the disks on the Macs, until I took over.  He was still running the process as if they were OS8 & OS9.  I cut it down to an overnight unattended script.
Justin BradshawOwnerCommented:
Ah, I remember the days of cloning systems on OS 9.  That part wasn't fun.
natekelleyNetwork Engineer - Small Business SpecialistAuthor Commented:
Strung - first let me apologize to all who posted. I have had my head buried in this project (among others) and forgot to accept a solution. Strung was the first to respond and I followed his recommendations. Using ccc I was able to quickly and easily create images and clone them onto the subject machines. The suggestions for migration assistant may well have worked great, I just didn't use them because ccc did it all and fast. Thank you all for your comments. Nate
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