Every 10-30 seconds something is clicking the disk. This is really annoying. I've run spyware and virus scans. Nothing found - all upto date. XP SP2 is fully udpated Latest drivers and bios updated. This is on a laptop with an 80Gb Samsung disk. It's like something is trying to 'hard write' to the disk, i.e. not caching it - the head is physically moving to where it is being forced to go making a distinct 'Ta-Tick' sound. I've used Taskmanager to shutdown everything that it will let me. Disconnected network cables. And yet it still does this random clicking every 10-30 seconds Is this software or is the disk doing some kind of diagnostic? Using Speedfan shows the SMART status to be 100% healthy. This only started happening in the last week. Any ideas?