Hey all, a couple of days ago my fusion drive in my late 2015 iMac toasted out on me... I received the dreaded prohibitory signal and after a long phone call with Apple support it seems as though the hard drive portion has died while the 128gb SSD is still ticking. After doing some extensive reading on the forums here I have decided to replace the hard drive with a 2tb Samsung 860 EVO SSD on my own. I have the drive, OWC install kit and bracket on order to arrive Monday. iFixit.com and this website have given me pretty much all the instructions I think I need to install the new drive... However, I'm not too sure what to do once its installed! So currently I have El Capitan installed on the small 128gb SSD. I also put a recovery install onto a jump drive. My questions are: Should I boot from the usb drive and format/delete both the SSDs? Should I completely disregard the smaller SSD from now on and only use the new Samsung one, or should I install the OS on the smaller original SSD? What about any apps that I install? Is the built in SSD slower/faster? I'm also really not sure how to tell the mac where to save files/programs from now on as the fusion drive just kind of took care of everything... Is there something that I need to do to combine the two? Or should they be split up somehow? As you can see, I am very much a novice and have no idea what to do once I get the new drive in. I appreciate all your help! Any other suggestions/tips that you may have please feel free to share!