SOLID STATE DRIVES---An overview:
For a rather in depth article on those fantastic, fast and more affordable solid state drives some of us are experiencing in new computers follow this link:
http://www.pcworld.com/article/2038511/the-care-and-feeding-of-ssds-what-makes-these-speedy-drives-hum.html#tk.nl_pcwbest
A bit technical but worth the read.