They do not seem to effect anything, but more than occasionally, I get a nice long list of these. Seems to be some timing problem--this computer is overclocked PIII so the IDE bus is running at 37mhz, not 33. If the eye is quick enough, it notices a message such as: ... assuming 33mhz, to change: ide=##.... Is it desirable to do this (or better left alone), and where might it be done?