Formating Mac, Need clear all partitions

I Want to clean my mac, and Format the whole thing,
even the partitions and start all from zero again..
But when I put the Mac drivers cd the options to install the Mac OS
it only shows one Partition showing that is left 95gb(out of 235gb)
how do I delete everything?
Thanks.

Go to the UTILITY menu instead of proceeding to Install.
Click on hard drive and not the volume name, click on Partition tab, change from "current" to one new untitled. Click Apply.
You could just select INSTALL of course, and then click OPTIONS and opt for ERASE and INSTALL method. But I really like to redo the partitioning.
I would: backup or clone your system to another drive first. And format it after booting from your external which insures your clone is working and bootable.

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Thanks for the replies.
@ mende1 - I did hold cmd-R to reach the recovery partition. How do I now leave safe mode (if it is stuck in that) and boot normally?
@ Thomas - DU seems to be successful in repairing the disk. It doesn't report any errors - just says what it is "checking", "updating" and "adjusting" (not a very long list at all) - but it concludes with partition map appears to be OK.
My other Mac has all my files so I don't mind reinstalling on this one, except for the fact that I would have to reinstall all the applications and I don't have them with me where I am at the moment.
If I choose to reinstall when booted with cmd-r will it re-download or install from a local copy? Re-downloading will take forever because I only have mobile (3G) broadband here.
Do I have any other options?
Thanks for helping.
/p

Formating Mac, Need clear all partitions

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