Mihai covered it. Here's my rundown: http://infrequently.org/2011/01/on-the-care-and-feeding-of-spinning-disks/ http://infrequently.org/2011/01/on-the-care-and

Mihai covered it. Here's my rundown: http://infrequently.org/2011/01/on-the-care-and-feeding-of-spinning-disks/ http://infrequently.org/2011/01/on-the-care-and-feeding-of-s...