larger than the market for mainframes. |-style="vertical-align: top;" | Personal computers || Minicomputers, workstations, word processors, Lisp machines |Personal computers combined all functions into one device. |-style="vertical-align: top;" | Pocket calculator|| 3.5 standard calculator||Equivalent computing performance and portable |-style="vertical-align: top;" | Digital calculator || Mechanical calculator || Facit AB used to dominate the European market for calculators, but did not adapt digital technology, and failed to compete with digital competitors. |- |Mobile Phones |Car Phones and MP3 players |The inherent portability of mobile phones and eventual Bluetooth integration into cars and mobile phones rendered the need for a separate car phone moot. A similar situation occurred once mobile phones gained the ability to play and store a significant number of MP3 files. |- style="vertical-align: top;" | Smartphones || All prior types of rudimentary mobile phones and PDAs || Smartphones were both a revolutionary (in the mobile phone industry) and disruptive innovation (displacing PDAs) as they were: generally more capable than earlier types of mobile phones, introduced and popularized entirely new services/markets that were exclusive to smartphones, had a secondary function as a PDA, and could leverage existing cellular data services and increased computing power to connect to and use the internet to a greater extent than that of a typical PDA (which were usually reliant on Wi-Fi and retained limited computing power). |-style="vertical-align: top;" | rowspan="4" | Data storage || 8 inch floppy disk drive || 14 inch hard disk drive || rowspan="4" | The floppy disk drive market has had unusually large changes in market share over the past fifty years. According to Clayton M. Christensen's research, the cause of this instability was a repeating pattern of disruptive innovations. For example, in 1981, the old 8 inch drives (used in mini computers) were "vastly superior" to the new 5.25 inch drives (used in desktop computers). The 8 inch drives were not affordable for new desktop machines. The simple 5.25 inch drive, assembled from technologically inferior "off-the-shelf" components, was an "innovation" only in the sense that it was new. However, as this market grew and the drives improved, the companies that manufactured them eventually triumphed while many of the existing manufacturers of 8 inch drives fell behind. |-style="vertical-align: top;" | 5.25 inch floppy disk drive || 8 inch floppy disk drive |-style="vertical-align: top;" | 3.5 inch floppy disk drive || 5.25 inch floppy disk drive |-style="vertical-align: top;" | Optical discs