In iStat Pro, what's the purpose of setting "S.M.A.R.T Update Interval" to something other than "off"? I understand that this may cause iStat to query SMART in my HD (MBP Early 2009) at the set time interval. But what does that give me? iStat doesn't show any new info anywhere after I set the update interval to 5 mins. At least, I haven't noticed anything new. Is it supposed to display the HD temperature somewhere? Is there something else I have to turn on? I'm using iStat Pro 4.9.