Inquiry informations from Italy

[jb2070]

Hi. How are you?
I have a problem. I hope that you can help me.
I have an old PC with some new Hard-Disk 40/60/80 Gigabyte, but my mother
board can see only the first 8 GB.
What I can do to use the space in the Hard-Disk Interly???
I hope also to install several Operative System in the same Hard-Disk. Yuo
can give me some suggests??
Sorry for my bad English and thank you for your help.
Greetings from italy
Sergio