I will be getting a (new to me) 2010 Mac Mini to be able to run some Snow Leopard compatible apps. I got this mini because it can run both Snow Leopard and Sierra. This is the last Mac Mini that can do this. Snow Leopard is the OS I will mainly use, (I think) but I want to play with Sierra and check it out because one day resistance will be futile. I'm going to install a new SSD drive in the mini (there's only one drive in this Mac Mini, its not the server) and I think I want to partition it in half so that one half is Snow Leopard and the other Sierra. Is this a workable plan? Or should I just install Sierra on a separate external HD via FireWire 800? I've never installed or downloaded any OS beyond SL, so I don't have any of those in my App Store history. I've been living in SL land since 2009. What's the best way of going about this? 1. Can Sierra be installed (after downloading Lion) on one of the partitions that was initially partitioned with SL? 2. Will I have to install SL on both partitions then upgrade (Via Lion) one partition to Sierra? 3. And once I have Sierra downloaded in my App Store history, would there be any benefit of starting all over again and formatting the drive with Sierra (vs SL) to be able to have a dynamic partition? 4. And lastly, would SL even install on a disc that was formatted and partitioned with Sierra's newer partitioning scheme? I have the original Snow Leopard restore CDs that came with the mini. Lots of questions I know. Just answering one of them would be helpful. Thanks in advance very much.