Hard Drive Question - Lost HD Space

[Lzen]

My coworker installed a 2nd HD to his PC about 2-3 months ago. The original was only 4 GB, but the new HD was 80 GB. He's been using Windows 98 for awhile. I finally talked him into buying XP and he brought it to me to help him install - as it turns out, he got it to the screen where it says it recognized primary master, primary slave, secondary master, and secondary slave. At the bottom, it says press DEL to enter setup. That takes you into the BIOS, CMOS, etc. Anyway, it would get as far as that screen and then it would do nothing else.

I tried first to go into the BIOS to make sure it recognized the CD ROM drive first. I even put the WIN XP cd into th other CD drive, but to no avail. After fiddling around in BIOS and CMOS, I selected user on the primary drives rather than the default auto. That worked and it got past the screen in which it was getting stuck. Anyways, I changed those back to auto after getting WIN XP going and everything was good.

Except for the fact that his new 80 GB hard drive was only registering as 32 GB. I tried installing using the NTSA and also installed as FAT32. Both ways still only showed the new hard drive as having 32 GB. XP installs fine and works fine. It's just that there is a bunch of space on his HD that we can't use. Any suggestions or ideas as to why it would do this?