Hardisk capacity support

I’ve a Pentium 166 MMX computer which I bought 3 or 4 years ago.I’m not sure what kind of
motherboard I am using and i would like to get an additional disk space by getting a
new 20G.B hardisk.Can you tell or check for me whether my computer which 3 to 4 years old
can support this 20G.B hardisk without requiring to upgrade my BIOS.
Thank you