Not real sure about those gateway recovery cds...but I do have a machine at my house from a client whose gateway machine has the ata66 controller in it....so it seems common for them to use that....If you are going to do a clean install with WinME then yes you should connect your drive to the primary IDE controller and install your O.S. then install the drivers for the ata100 controller before connecting the drive back to it.

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