The ‘Data Discman’ was launched in Japan in 1990, and released the following year in the United States. It was the world’s first electronic book reader (or ‘player’, as Sony called it). Its 3.15 inch miniature discs could store up to 100,000 pages of text, or 32,000 graphics.
Source:
http://collections.vam.ac.uk/item/O1...y-corporation/
If you want to get one shopgoodwill has one on sale ending on 4/24/2018
https://www.shopgoodwill.com/Item/51634027