Introduced on July 17, 2002, at Macworld in 10 GB and 20 GB capacities, the 2nd generation iPod replaced the mechanical scroll wheel of the original with a touch-sensitive, non-mechanical one (also manufactured by Synaptics),[citation needed] termed a "touch wheel." - although cosmetic-wise, this looked almost indistinguishable to the original iPod. Due to new Toshiba hard drives, the 20 GB iPod slightly exceeded its 1st generation counterpart in thickness and weight, while the 10 GB model was slimmer. The 2nd generation iPod came with a carrying case and wired remote and it was the first generation that was officially compatible with Windows (although it is possible to reformat 1st generation iPods to be Windows-compatible).