disk has low idle time

Hi all

I have an SBS server 2003
At least two or three times  a day I receive the following error message
 
Alert on SERVER at 5/13/2011 3:56:09 PM

The following disk has low idle time, which may cause slow response time
when reading or writing files to the disk.

Disk: 0 C: D:

Review the Disk Transfers/sec and % Idle Time counters for the
PhysicalDisk performance object. If the Disk Transfers/sec counter is
consistently below 150 while the % Idle Time counter remains very low
(close to 0), there may be a problem with the disk driver or hardware.

If the review shows that the disk is functioning properly, use Task
Manager to determine which processes are causing the majority of the
disk activity. You can attempt to correct the problem by stopping and
then restarting those processes.

You can disable this alert or change its threshold by using the Change
Alert Notifications task in the Server Management Monitoring and
Reporting taskpad.


Can anyone help me with this one to figure out why I am getting this report and what can I do to stop this issue

thanks
Robert