p.s.
at the bios the h.d is shown.
i decided to reformat with different copy of xp installation but at the screen when it ask you were you want to install xp again there wasnt ny remind of the missing h.d which by the way i forgot to mention that its sata , if its important.
anyway when i didnt see it there i stop the proccess , since maybe the problem is not realated to new xp..