Compatible ipods

I recently purchased a 30gb ipod classic 5th gen and my head unit would not recognize it. It recognizes my iphones (3G and 4) as well as my 4gb ipod original and my son's ipod nano 6th gen. Anyone know if earlier 4th or 5th nanos work and at what storage sizes. I am looking for 16gb that will work with the head unit

The dealer has a list of iPods that are compatible.

Yeah my iPhone won't play on my 2008 650 either .I hope some one helps us.

i have a '05 645 ci vert and would like some guidance on what
"ipod integration kit" is needed so that i can listen to "music downloaded on my smartphone and sometimes pandora" through the car system. i also want to be able to charge the phone as it plays (without plugging into the cigar charger)..thanks in advance...