iPod nano (original, 4 GB, white, 2005)

The iPod nano replaced the iPod mini as a full-featured alternative to the classic iPod at the time. The iPod nano featured 1, 2, or 4 GB of flash memory in a 3.5-inch tall, 1.6-inch wide, and 0.27-inch thick white or black case. The color screen measured 1.5 inches at 176×132. The iPod nano is navigated by a Click Wheel and supports viewing photos. The design of the case features a jet black or iBook white front and stainless steel back.

Software functions included Screen Lock, a stopwatch, and a world clock. The iPod nano held approximately 240, 500, or 1000 songs and up to 15,000 or 25,000 photos that were downsampled to fit on the 1.5-inch screen.

Source: EveryMac.com

iPod Generation 3 (40 GB, 2004)

The iPod Generation 3 was available in three sizes: 15 GB, 20 GB, or 40 GB on a 4200 RPM ATA-66 hard drive capable of storing 3700, 5000, or 10,000 songs. It used a 2-inch (diagonal) monochrome LCD display with blue-white LED backlight in a case with an “iBook white” front and a polished stainless steel back.

This iPod was thinner, lighter, had a more rounded case design, and introduced the idea of an iPod dock for easy connection to a computer or stereo. The buttons were changed to solid-state (instead of the earlier physical buttons) and moved from around the click wheel to a row above the click wheel.

Source: EveryMac.com