Hi, I read the article "How to separate a Fusion Drive" by Aden White and have a question for some forum user who knows the subject: I have a Mac mini (late 2012 2.3 GHz i7 1TB HDD). I put a 120GB SSD. My purpose was to let the two separate discs. Put the OS on the SSD and HDD left empty. I did not want to drive fusion. To do this follow the instructions of OWC http://blog.macsales.com/15619-special-note-for- adding-an-ssd-to-a-2012-mac-mini/comment-page- 1#comment-63329 In the course of the operation and display both chose the SSD disk to install the operating system (boot disk) and the other thought it would be empty. But it turned out well. On the screen appeared the two discs but to my surprise on the HDD are the same applications on SSD. Further. The download a pdf was mounted on the two discs. I wanted to see what would happen if I delete an application from the HDD and the SSD also erased. Format HDD with the security system of the 7 "0" it took about 24 hours. All applications were equal in the HDD disk. I rebooted the computer by clicking the "alt" and informed me that he had two albums the SSD as a boot disk and HDD below said. "Recovery disk 10.8.3). How I have to do to completely erase the HDD and keep the SSD as a boot disk? Thank you very much to anyone who can help.