How to fully utilise a 10 GB harddisk

[Tamas.GAIDOSCH@kpmg.hu]

Hi folks,

I got a 10 GB IDE harddisk (/dev/hda), but cfdisk 0.81 of slink only sees 
approx. 7.5 GB of it:  
240 heads x 63 sect/track x 1023 cyls = 15467760 total sectors

How can I use the missing 2.5 GBs?

The machine is a rather up-to-date PIII.  It came with NT Wstn preinstalled,

and that saw all 10 GBs.  After I erased NT and tried to reinstall it 
(surptise, surprise), the NT installer only saw approx. 8 GBs...

This is a bit confusing to me.  I try to RTFM, but any help would be
appreciated.