my mac mini has 2 drives installed: the original 1TB Hdd and a 250GB SSD. I wanted to sell this mini and tried to format the SSD from which it boots by loading the internet recovery and using its disk utility. Something went wrong and now the disk utility shows the two drives as one logical volume, a 1,25 TB fusion drive. When trying to install OS X now there appears no startup volume to install it. Going back to disk utility, there is really nothing I can click there besides verify disk or repair disk which doesn't help at all. How can I re-format the volumes? Thank you for your help!