I finally got around to ripping my 2012 mac mini i5 apart and install the second drive kit to add a 240gb SSD drive. It's a pretty fast drive with 530read/480write. Running the whole OS over the SSD is blazingly fast and a clear winner if it was not for currently as it's a family computer, there is about 200gb of data stored on the mac. This gives a limiting factor for who gets something fast and who gets the slow built in hard drive. Also you are then stuck having to move the data back and forth between the two drives depending on speed needs. When I got my work iMac it came initially with a 1tb Fusion drive and it was simply fast. That was only a 120gb SSD fused with a 1tb hard drive. Now admittedly the SSD and HD were faster spec'd than what is now inside this Mac Mini, but the SSD inside is also larger (240gb). From what I remember, it will use the SSD both as a cache for reading blocks, along with put the most needed files into SSD so they are faster, and the not needed files get moved onto the HD partition. This effectively would give me a single 720gb drive that appears to be really fast, rather than two single drives which one is blazing fast and the other is dead slow. I am giving in to making a carbon copy of the current install for archive backup purposes. Wipe the two current drives and start from a clean slate, migrating all the data required back onto the new setup and re-installing all the apps from new. I know that my current Mac Mini might have some OS files that are not optimum and is doing some funny things that starting from a wiped install is likely a good idea. What are your thoughts and most importantly WHY?