I have thesame question
DId you get any responses yet?
Can you be more specific please? Where do you see this message?
You might get such a warning if you enabled "Disk Read Bytes" counter and specified the maximum value for it and value they get is exceeding. You can check "Windows Monitors" and check the section "Analysis of Test Results" ( field : Disk Read Bytes per Second ), but it also might be an SQL monitor.