Thanks for the link to the MacWorld article. I had only found one reference to "breaking" the Fusion Drive via a convoluted process in Terminal that I was not entirely comfortable with, especially as it was a site of unknown reliability.
I can see where it would be useful to have an "automatic" Fusion process, but it would be even better if you were given the option in Disk Utility. I suppose someone ought to send that in to Apple. At this stage I am not fully convinced of the stability of the Fusion drive. One of its risks, as I am certain you are aware, is that, if anything goes wrong, all is lost on both physical drives...better have a current backup. The fly in the ointment though was the inability to use the drive. It was there, but I was unable to access it for any purpose. I am wondering if it thought that it was an Apple drive at first and then there was some odd thing that was different that resulted in it being unusable. Had I been able to access it, I probably would have given it a try as the path of least resistance. My original intention had been to use a 240 GB OWC SSD as the boot drive (leaving the home folder on it) and use the rotating drive for digital image files, iTunes and other such things. (I need to read up on Lightroom and Photoshop to see if I should be loading the files on the SSD initially and archiving them to the rotating drive from within those applications or just what, but that is something for tomorrow or the next day.
I went ahead and pulled the drives out and am in the process of formatting them as individual external drives at the moment. When that is done I intend to try a net restore to the SSD as an external drive and then see if I can make a disk image of that with CCC to be able to duplicate a clean "as shipped" install if needed. It would have been nice to have had a restore disk/flash drive, but anyway.
I appreciate your kind assistance. I'll check back in a bit.
[Edit] Update: Whatever Disk Utility did to the drives was really nasty. The Mini did not recognize them at all when attached as individual external drives (one at a time). I hooked them up to another Mac which did recognize them and formatted them with Disk Utility. After that I attached them to the Mini (one at a time) and formatted them again with Disk Utility just to be sure that everything was copasetic with Mountain Lion.
I then restarted the Mini with the option key and selected Restore. It recognized the external drive I had formatted. I selected the external drive as the target for a new install. The download is taking quite a while, even on my cable connection, although I am only connected to a FW800 interface.
When it eventually finishes I guess the best bet is to create a disk image with CCC which, I hope, will include the (hidden/invisible) Recovery Partition.
Edited by RBR - 11/28/12 at 7:18pm