HD light blinking kb#

I had been concerned about my hard disk light blinking
every few seconds.
FYI, I found a kb article,KB138598, called "Disk Drive or
CD-ROM Access Light Blinks Every Few Seconds". The CAUSE
section includes this line:
"If your computer contains a SCSI controller, Windows
polls the SCSI bus periodically to determine the status of
the bus and the devices that are installed on the bus. On
some computers, the disk drive access light on the front
panel turns on when any SCSI device, or the SCSI bus
itself, is accessed. On these computers, the disk drive
access light turns on each time Windows polls the SCSI
bus."
Under STATUS it says that the "...behavior is by design."
There is a fix if the CDROM light blinks, however.
Harriet