how do i reset ipod classic 30gb

You are posting in the iPod shuffle category. If your iPod is a "classic," and you need to do a "Restore," this document describes how to do it. This will erase the iPod, reinstall its software, and set it to default settings.

http://support.apple.com/kb/ht1339

If you only want to "Reset" the iPod, is document describes how to do it. This just restarts the iPod (like rebooting your computer).

http://support.apple.com/kb/ht1320