From MacFixIt;
Generic iPod icons We continue to receive reports that after applying the update, users' iPods no longer have custom iPod icons in the Finder.
MacFixIt reader Chris Habig reports a potential fix:
"I too, got the generic disk icon for my iPod following the latest security update. It's simple to get it back, though. In Panther's terminal (located in the Applications/Utilities folder), execute the following command (all as one line, make sure no line breaks exist) to rebuild the launch services database:
/System/Library/Frameworks/ApplicationServices.framework/Versions/A/Frameworks/
LaunchServices.framework/Versions/A/Support/lsregister -kill -r -domain local -domain system -domain user