Space issue on Windows 2000 Pfof system .

I have 240 GB harddsik and i have installed windows 200 PROfestional .But only 140 gb is recongnised by windows .can some tell giude for this issue .
Is windows 200 prof support upto 140 Gb ?
is any windows patch available which shows me remaining harddsik size in window so that i can use that ?

what is a maximum amount of harddisk windows support