Now I have tried everything, for my Pc to work I need my OS which is the WDC 250GB on sata 2 at end of chain, I have had to set usb dock sata bridge which is maxtor 80GB as first position on boot order, otherwise I can't start windows, & the new hitachi 250GB is at sata 0, so my boot sequence is USB drive first, Then sata onboard drives, then cd rom third, then finally diskett floppy drive.In drives option all drives are turned on, for drive sata 2 the description reads wdc wd2500 e.t.c, for sata 0 description reads (unknown), In windows drive 0 is not detected at all. I am stumped. Please somebody tell me there is light at the end of this tunnel.