opinions differ if this can be called 7th or 8th generation. there are only 2 different 160GB iPod Classics - the one released in 2007 which features a 2-platter HDD (and no Genius and no Support for the iPhone-style remote headphones) and the one released in 2009 with a single platter drive, Genius, Genius mixes and 3,5mm Jack Remote support
best regards,
Monsieur Baguette