I have an old macintosh and I don't use macs at all. What I want to do is reformat the hard drive and then reinstall the OS back on it. So, there are two parts to this question, one is how can I make a boot disk for the mac and secondly how do I use the boot disk to format the hard drive so that I can reload the OS back on it. Right now the mac is up and running, but I just want to clear everything off it and start new. Please be detailed with your instructions, like I said I don't use macs at all.