Ibm 40 GB HD

I have an old ACER pc( 1997),200 mhz intel processer, 64 ram, and a 4 GB HD with a v55la motherboard, 4 GB HD is to small, i have a 40 GB HD from ibm( GXP 7200rmp udma 100) when i fdisk it i can only see 8 GB of the 40 GB, i have updated the bios but it is still the same, is there a tool like the maxtor tool for a ibm HD, or is there another way to do the trix :rolleyes:

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Nice to help myself