It seems this motherboard is a bit of an oddball. Apparently, there were three types manufactured all with the same model number.
The oldest only supported UDMA 33/66 drives and the later UDMA 100, however, a UDMA 133 drive will work, but at the slower transfer rate.
You need to investigate the BIOS version to make sure it will support a 120GB drive. Some older BIOS's wont, but I don't know if this applies to your motherboard.
Alternatively, you could use layering software supplied by the drive manufacturer, to overcome that hurdle, should it be necessary.