I've just installed a 2nd HDD in my tower & it did show up in the bios, it tried to boot from it so I swapped that round in the BIOS then restarted & went into XP OK, it then flashed up in the corner - new disk detected but still doesn't show up in my computer.
It does show up in device manager but says
Status: Not initialised
Partition Style: Not Applicaable
Any ideas what I can try, it's a seagate drive model: st3160211as