This question was asked in some form a few weeks ago by someone else. I tried the solution offered there, but had mixed results. My wife's PC at work crashed on her several months ago, and I wound up reformatting and reloading it for her. The machine had dual 40gb HD's in it (it's a Dell if it matters)and since the machine didn't have a CD burner on it (and it wasn't on a network) I removed the primary HD and set it as a slave in an identical Dell system at her work. I was able to back up her data, then I plugged the HD back into her machine and reformatted. The O/S would never completely take on that HD for some reason. I can't remember the exact errors I got, but I finally wound up loading the O/S on the spare HD. No problem. I took the old HD home and put it in as a slave on my system, but since I've never been able to access it. It shows up in the Device Manager just fine, but Windows Explorer will not display it. The previous post I mentioned said something about formatting the drive using Disk Management (using XP Pro). I found that utility and the drive shows up there, but the only thing I can do (by right clicking the drive) is show the properties of the drive, and convert it to a basic or dynamic disk. BTW, the drive only shows up in the bottom window of Disk Management. Not the top window where it shows the drive volume, layout, type, file system etc. Only my primary drive shows up there. In the bottom window the extra drive shows as Disk 1, Basic, 37.27GB, Online and Unallocated. Is this drive just bad or is there something I'm missing here?