Hi DieSse. Situation is this: I am upgrading [more like re-building]. I am changing my A7N8X mobo for A8N-SLI, together with a new CPU socket 939. I am really worried about losing data and a bit stunned by all the preparation necessary (as advised by different forums) - backup discs, installation discs, BIOS flash floppies etc etc. My secondary PC has only a small HDD so I thought about buying another HDD to do my re-build on then any problems and I lose nothing. When all is well ;-), the 2nd HDD can go over to the secondary PC. I have been advised that SATA is better for performance and although both mobo's in question support SATA I am not certain the one "in situ" is wired as such? * are IDE and SATA two completely different HDD's or just the data transfer between? What I mean is can one HDD be both but wired in a different way? Sorry if this sounds a bit dumb but I really thought when I bought these components one just had to be careful how your installed them...Wrong...I now find myself several steps up the learning curve and more than a bit cautious ( for cautious read scared).