datapad vs iPad

datapad

noun
  • A tablet computer, a personal mobile device 

  • A small handheld device used to gather, send, or process data. 

iPad

noun
  • A lightweight low-power tablet computer of a particular range from Apple Inc. 

  • Any lightweight low-power tablet computer. 

How often have the words datapad and iPad occurred in a corpus of books? (source: Google Ngram Viewer )