how do i restore from I pod to i tunes. had to replace hard dirve

See this support article:

http://support.apple.com/kb/HT1848

You can also download at least some of your content (audiobooks being a notable exception) again from the iTunes Store:

http://support.apple.com/kb/ht2519

For additional instructions, particularly for content not purchased from the iTunes Store, check out this user tip from TuringTest:

https://discussions.apple.com/docs/DOC-3991

and this page on "How-to Geek":

http://www.howtogeek.com/104298/sync-your-ios-device-with-a-new-computer-without -losing-data/

Regards.

Forum Tip: Since you're new here, you've probably not discovered the Search feature available on every Communities page, but next time, it might save you time (and everyone else from having to answer the same question multiple times) if you search a couple of ways for a topic, both in the relevant forums and in the Apple Knowledge Base, before you post a question.