The Apple iPod is a line of portable media players designed and marketed by Apple that was aunched on October 23, 2001. The popular product line-up currently consists of the hard drive-based iPod Classic, the touchscreen iPod Touch, the compact iPod Nano, and the ultra-compact iPod Shuffle. Apple iPod Classic models store media on an internal hard drive, while all other iPod models use flash memory to enable their smaller size. There was also an iPod Mini that used a Microdrive miniature hard drive. As with many other digital music players, Apple iPods can also serve as portable external data storage devices. Storage capacity on the iPod varies by the model and ranges from 2 GB for the iPod Shuffle to 160 GB for the iPod Classic. All of the Apple iPod models have been redesigned multiple times since their introduction. The most recent Apple iPod models were introduced on September 1, 2010.