Nope, you got the wrong info. The BIOS will not handle more than 8gig cause it only uses 24bits for the cylinder, head and sector addressing. INT13 BIOS extensions added 4 more bits to address upto 128gig. You will need a software get around (not really recommended) a BIOS update, if there is one or, the best solution, an ADD in PCI Controller (promise ATA66 are good). Since most drives are ATA66 you will get the better performance and the BIOS support for about $30.
Update, maybe I mis-read 'partition it down'. You can set the cylinder head and sector manually which will limit the size, but this is not 'partitioning'.