I have several embedded pc's experiencing a wierd problem. Systems will lock up after being in service for some time. Failed systems will hang on reboot until drive (Toshiba MK4025GAS) has been disconnected and another drive connected. When the original drive is reinstalled, it will then boot correctly. It appears something is being reset by installation of another drive. Original drive will only work after another drive (Toshiba MK4025GAS, that's all I've got) has been installed and booted. Any Ideas?