Okay, this has really started to get on my nerves. Once in awhile, every 3 seconds or so my hard drive will have read/write activity when it's idle (with no programs running). I've been able to pinpoint it to the "coreservicesd" process. If I force quit this process, the disk activity stops. See the screenshot below to see the spikes in disk activity from within Activity Viewer, and notice coreservicesd in the active processes. Does anyone know what the heck this process is doing? It gets really annoying when you start noticing it.