Hey Guys. I bought a Samsung SSD, put it into an external case and connected it via USB 3.0 to my iMac 21" Late 2012. Then I saved all my files and deleted everything on the disks. Also, I formated both into Mac OS X Journaled (Extended). After that I tried to make a DIY Fusion Drive. I used the terminal commands recommended on tutorials of the internet. All that went fine. The HDD and the SSD were shown as one disk and everything seemed ok. Now I tried to install Mavericks. After a couple seconds into the progress I got an error telling me that Mavericks could not be installed because it was not able to create a recovery disk. I tried several times and even did the whole process with the fusion drive again... Nothing. Also I noticed that in disk utility it tells me that my disk "Macintosh Fusion Drive" has 1.12 TB of Storage but also that 1.11 TB were "in use" which cannot be true since there is nothing on the disk?! Anyone knows how to fix this? Thanks!