Hi -Jk-
Jan Steunebrink (aka BiosMan) patched my DFI 586IPVG Rev. AD+ for up to 128GB HD, while also modifying it to be able to run the AMD K6-2/III + Series CPU's.
While you don't have the (easy) ability to run one of those, I'm sure Jan's patch will work for your HD problem.
Jan can be e-mailed at
J.Steunebrink@net.HCC.nl, and you can visit his website at
http://web.inter.nl.net/hcc/J.Steunebrink/Index.htm.
Alternately, one of the associates here can try their HD patch utility on your BIOS.
Good Luck!!