Lightstar - it is a continuous on and off light every other second. I have no scanners running and all virus and malware scans I have run say I am clean.

Nothing to worry about. It's just a RPM gauge for the hamster wheel.

Jafo wants one too ...

Mine blinks almost every second too Kona, sometimes quicker and brighter occasionally too even when I am not doing anything, but I do not worry about it. Probably just a service the OS needs to run that you cannot control.

Is this keeping you up at night?  

Tip: The light will go out if you turn the computer off.

...........................you hope....

Only, if you kill the hamster.....

Are you aware that Windows 7 has a service called Superfetch that tries to memorise user habits and pre-loads applications to memory so that they are available for fast start? If your schedule is consistent (for example you read mails from 6-8 p.m., and start playing Counter Strike after 8 p.m. every day), you should experience very fast system response. The downside is of course a lot of IO activity - your drive does not stop. Also, some background defrag is running when your own activity is not IO heavy.

Not on my computer. I have the auto defrag set to off.