hey, i've used Fusion in the past & it left one large file on my hard drive. I want to switch to using Virtualbox which I guess runs the same way, this is the first time I've used it with an SSD though. Is this recommended with an SSD? my thinking is, say I make a 32gb virtual disc, doesn't everything I exit the virtual system, it write back 32gb of data? or is my understanding of everything wrong thanks!