Intel SSD
SSD Hosting or hosting on a solid state drive is the current state of the art for hosting and its important because most websites today are database driven and PHP and Specifically MySql which is used to drive these sites has limitations on how much data it can cache at anyone time so when a server which has thousands of database driven websites starts to have a large number of users visiting those sites the hard drives cant keep up with the demand and the wait state starts to increase dramatically.