I have a couple of questions that I couldn't find answers for, hoping someone here can help out. Thinking of getting an external SSD. I'm thinking that I install a version of Mavericks and other well used applications there. Data I leave on the internal hard drive - right? Do I need to format the internal drive once the OS is booting from the external or does it/can it remain there for when/if the SSD gets a problem? Installation of an internal SSD appears to be both far more expensive than external and the idea of wielding a screwdriver does not fill me with good thoughts. Finally, how reliable are external SSD? Thanks for any guidance.