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  First model, with mechanical scroll wheel. 10 GB model released later. Capaciy 5, 10 GB.
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  . Using the same body style as the first generation, Touch-sensitive wheel. Hold switch revised.
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  First complete redesign with all-touch interface, dock connector, and slimmer case. Capacity 10, 15, 20, 30, 40 GB.
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  Adopted Click Wheel from iPod Mini, hold switch redesigned.Capacity 20, 40 GB.
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  Second full redesign with a slimmer case, and larger screen with video playback. Offered in black or white. Hardware and firmware updated with 60 GB model.
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  Introduced the "Classic" suffix. New interface and anodized aluminum front plate. Silver replaces white. In September 2008 the hardware and firmware was updated with a 120 GB model replacing the 80 GB model.