Thanks 'Fernando 1' for detailed answer, first, you right, my optical drive made the problem. as you suggest i tried firmware update, still no boot. then i installed my old IDE CD-RW and... ... finally i have bootable optical drive in AHCI mode. (thanks for this tip, i didn't know optical IDE can do this...), old drive for boot and installation - and "problem" drive just as a burner - i'll live with that. thanks for your help and tips. btw, sooner or later i'll make fresh WINXP-AHCI install, until then, i'm trying to fix the SATA controller installation from 'device manager', not obsessive about that, i'll give it chance. i reach to this point, how to continue from here...?