lolz there is big deifferene in firmware and body and genration bitween ipod and ipod classic, plz check out this check out this
http://www.everymac.com/systems/apple/ipod/ipod-faq/difference-between-ipod-classic-and-ipod-enhanced-5th-generation.html
Details
iPod (5th generation)—also known as iPod with video or Fifth Generation iPod
The iPod (5th generation) is a a hard drive-based iPod featuring a large, widescreen color display, a Click Wheel, and the capability of displaying photos and videos. Like iPod nano, it uses USB for syncing and comes in white and black.
iPod classic
The iPod classic(6th generation) is a hard drive-based iPod (80 GB or 160 GB) featuring a large, widescreen color display, a Click Wheel, and the capability of displaying photos and videos. Like other models, it uses USB for syncing. The iPod classic is available in silver and black, and has an anodized aluminum and polished stainless steel enclosure.