03-07-11: PerrewThat was true in some cases a few years ago, but no longer. As a rough ballpark, I would expect a typical SATA2 SSD today to provide sustained read transfer rates of around 200 MB/sec. I'd be surprised if the stock HDD in the OP's several year old Mac Mini could do more than around 50 MB/sec, and perhaps even less.
I thought regular HDDs did sequential (what most programs do) loadings faster than SSDs?
And of course in terms of random access times, which are particularly important for an operating system drive, the SSD would probably be more than 100x faster.
Regards,
-- Al