I have an early 2008 Macbook Pro and recently, it seems like there are random 5 minute sessions where the hard drive would make noises as if Spotlight is indexing. However, during this time, nothing is happening. Just me browsing the web, not doing anything special. When the hard drive does this, the whole computer slows. It can still be used, but opening new tabs in Safari can take a good 5 seconds and same with opening programs and finder windows and sometimes I even get the beachball. Sometimes the computer doesn't slow down, but the noise is just not acceptable especially when I'm not video editing or anything. I look under Activity Monitor and it seems like there is a lot of data being read and written. Does anyone know why this is happening? I don't recall this happening under Leopard, only Snow Leopard.