Reply to How do people utilize dual drive laptops?

So I am believeing about merging my 2 macbooks.
Typically one is used strictly for mixing, the other for day to day use and school work. I am about to graduate and believe 2 laptops may be overkill. I thought having adding an SSD to the one i want to keep for all my mixing and music stuff.
Am I correct this should give me solid reliability?
Would I have an OS on each drive, or just the music related files?
I am new to this, so I am curious to see how people utilize their dual drive setups, and/or which direction i should go.