Hi all, I'm running windows xp with a Mat****a UJ840-D. After I resume from hibernation, my drive disappears from the 'My Computer' window. My computer does not recognize the drive at all. (This means no device manager or safe mode) I have tried deleting the Upper Filters from the registry. I also tried restoring my Upper Filters from when I last reinstalled windows. I tried the fix from dougknox. So far, I am completely unsuccessful. Any help would be greatly appreciated. Thanks in advance.