Hi Spr. I'm not sure about the Chdsk (or is it Chkdsk) command in Windows XP, because I'm using Windows 98se. I think it is a Start - Run command. If your drive is showing as Secondary Master drive, then it's probably connected to the wrong motherboard IDE connector. Open the box, unplug the IDE ribbon cable from the motherboard and plug it into the IDE connector alongside the one you removed it from.