1. What are your system specifications ?
2. You probably have an older computer, say, vintage '99-'00 or somewhere thereabouts.
Machines of that era can only typically address up to 137GB
The 137GB ceiling.
The way that I have addressed this issue is to flash BIOS with the latest update that usually contains instructions for "Large Drive Recognition"
3. Flashing BIOS has risks. If done incorrectly, the computer will not boot.
In the 99% of cases done correctly, the computer gains a new lease on its service life.
4. System info is needed.