That is what I'd reccommend, purchase an ATA-133 PCI card and hook your drive into that. Read the system requirements before getting the card. The onboard BIOS driver for the ATA-133 card loads and give the motherboard the capability to use Int-13 extensions, allowing almost endless max HDD capacities. Plus the cards are cheap, try www.newegg.com
for the best deals. Good luck.
An additional reason to get an ATA-133 card would be throughput. The card should be able to handle whatever HDD you throw at it, as long as it's a PATA HDD. Even if you partitioned the drive to work on your system, you still wouldn't be able to utilize the HDDs max data transfer speed. That is if it is faster than what the mobo BIOS can handle.