(Christensen model) Disruption is about business models, not competition. New technologies that help existing companies improve their products are "sustaining i

(Christensen model) Disruption is about business models, not competition. New technologies that help existing companies improve their products are "sustaining innovations" (e.g. 2.5" hard drives let laptop companies make smaller, better laptops). But if they don't help existing companies and allow the development of a "worse" alternative, it's a disruptive innovation (e.g. SSD drives were too expensive and low capacity for laptops, but they were perfect for iPods and smartphones, which have now surpassed laptops in sales, use, etc).