Hi guys, This is gonna be my first topic on this forum. I'm gonna explain my situation. I have an iMac Late 2014 witch has fusion drive. I have worked on it for several years now. No Problem. I wanted to upgrade my Mac with an SSD and I decided to do it external over thunderbolt, Which work perfectly fine. Settings: SSD is my startup Disk with High Sierra on it. Fushion Drive: Still available with High Sierra on it. So basically I can switch between the one and the other. BUT!,...When I'm on my SSD,...OSX sees my internal drive ( fusion ). That makes sense. But It also recognize my programs from internal drive. So...High Sierra looks like an clean install,...but I still got Team viewer and different plugins and some add-on program from my fusion on my clean install on my SSD. Is there a way....without formatting the fusion drive to have them totally separate? Or can I unmount ( Software ) the internal drive during the OSX on my SSD?