Only retail discs can start multiple types of machine. Even then, the disc needs to be of suitably high version number for the machine in question -Macs are specific to which version they'll boot from too, as well as the 'big cat' identifier.
So our iMac12,1's won't start from our 10.6.3 retail disc, as they shipped with 10.6.6.
- Boot the hardware you need an image for from the Recovery HD by holding Command-R at power on time.
- Plug in a Journaled HFS+ formatted external disk.
- Select the Re-install OS X Lion option and target the external disk.
- Once the Installer finishes downloading, simply shutdown and unplug the disk.
Now when you mount that external disk you will find a directory named Mac OS X Install Data on the root. Inside of this folder is the elusive, hardware-specific, InstallerESD.dmg image that you can feed to SIU or any other imaging tool of choice. Having this installer will now allow you to build out re-deployment images for all of your hardware until rollup installers are available.
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