Howard -- Glad you could take advantage of Tennessee's tax-free weekend on computers. Unfortunately I had to miss it. I believe Thom Holland may have gotten you scared for no reason. An ATA is sometimes known as an IDE. I have installed an ATA-6 in a G3. The ATA/IDE standard is so common in the IBM world that backward compatability to ATA is almost a given. I can give you a published reference on ATA/IDE if you are interested. Check the Apple Knowledge Base at http://search.info.apple.com/ (note the absence of "www") for further information. Apple can also supply manuals at http://www.info.apple.com/manuals the last time I downloaded one. Hope this gives you the confidence to forge ahead on updating your G4. I am very much interested in your results because I too have a G4 and want to use it for my OS 9 mathematics files of the past ten years, as well as OS X. Best of luck and keep in touch. Charlie Nowlin Oak Ridge, TN <nowlin at esper.com>