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dell optiplex gx1 500 mhz bios a10 win xp drive not visible

i am trying to put a 40 gig hard drive in my kids dell.
if the hard drive is the master (has xp) then the bios show it if tou enter setup, but it says primary drive fails.
if i set it as the slave (with xp) the bois sees it, but it doesn't show up in windows explorer, or the device manager list.

is it a 32 gig drive limit or something else?