Original post by: oldturkey03 ,
[http://support.apple.com/kb/HT1478|This here] shows you how to use your ipod as an external drive. If you are thinking about using just your harddrive you will require a USB-to-Zif adapter. They are available at eBay for about $5 When plugged in your OS system should see that drive as an external hdd. Good Luck to you.