The original iPod predated even the flash-memory iRiver products by at least a year.
When the iPod was released its sole competitors were the Nomad Jukebox and the Compaq PJB-100 -- both of which were HUEG (2.5" hard drives), had shit for battery life, were made of the creakiest plastic, and took several minutes to boot up and index your files (due to not having an index (drag-and-drop has consequences!)).