See if you can get the drive parms.... heads, cylinders, sectors per track and then see if there is a user setting in the bios for the Primary drive. Drive type 46 is used in many cases. But, even if you have this and the bios doesn't support LBA or Init 13 routines you may not be able to see more than 16 meg. In that case look at a EIDE addin card with onboard bios. As always look at
www.pricewatch.com to get a feel for what the cards are going for.