Can't boot on my external hard drive on another Mac (stop sign)

Hi,
My system is placed on an external SSD connected to my iMac.
I've just bought a brand new Mac Mini and I wish to boot it using my SSD.
When I pick it up in the startup alternatives list (maintening the "Alt" key pressed during the boot), I just get a gray screen with a stop sign at the middle. Then the Mini shuts down.
Isn't it possible at all to use the same boot disk on my iMac and on my Mini ? (I don't intend to use it constantly on both, I was just hoping to migrate flawlessly using the same System disk).
Note :
- when I plug it back to my iMac, the iMac boots up normally
- if I boot my Mac Mini using the internal hard drive, I can access to all the content of my SSD. I performed a full disk check on it using the Disk Utility and everything's fine. I just can't boot with it.
- of course, both of the systems (iMac/SSD and Mac Mini internal HDD) are up-to-date (10.8.2)
Thanks for your help.

Most likely, the new mini can't boot with the iMac's components. See Don't install a version of Mac OS X earlier than what came with your Mac and Computer-specific Mac OS X releases for details.

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