what to do when 'unknown error occurred 1413' appears
i cannot restore my ipod classic, can someone please help.
iPod classic
Try removing and Plug-ins you have installed with iTunes. See here for more information.
iTunes: Troubleshooting issues with third-party iTunes plug-ins
Otherwise, try to reformat the iPod's Hard Disk using the instructions in this article.
http://www.methodshop.com/gadgets/ipodsupport/erase/
More often that not, this particular error message can be a good indication that your iPod's HD is going bad or faulty.
If possible, try another USB cable and port as well as restoring it again on another PC.
B-rock