Open the installer at boot but click utilities in the menu bar > disk utility. Select current installation > erase. Close disk utility. Proceed with new installation.
At the very top of the screen look for Disk Utility or some such, click that then look for Erase Drive. Erase your partition and Robert is your Dad's brother.
You should, even if it's to a portable hard drive![]()
Can I jump in with a quick question too, is it possible to restore my Applications as well from a Time Machine backup if I reinstall Snow Leopard? I had backed up all the installation DMG's but the drive got corrupted and I had to format it.