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Message: <blockquote data-quote="MacInWin" data-source="post: 1896431" data-attributes="member: 396914">It is not that DU won't allow partitioning of free space, it is that it won't allow partitioning/erasing/formatting on the boot drive. You finally got to format the internal drive when booted from the external drive. I told you that in post #11.DU will work if you are booted from an external drive into the Recovery Panel (post #8). I've done it lots of times. I've never had to use the command line. I don't know why your setup wouldn't allow formatting of the internal, once booted from an external, but DU will definitely do that, normally.Mac OS installers, when booted from external drives, offer Disk Utility from which to format the target of the installation. It's how you replace a drive on a Mac. Build a bootable installer external drive, replace the internal drive with a new one, boot from the external, use DU to format the new drive for the Mac, run the installer and you are done. I've done that multiple times as well, as have others here on this board. I don't know why you had to use the command line interface, or Windows, to install the system. I've never heard anybody say that was the case, before your experience. Done properly, a bootable external drive with the installer application on it will boot to the Recovery panel I posted in post #8 and allow DU to be started to format the target drive.</blockquote>