disk vs rotary dial

disk

noun
  • Something resembling a disk. 

  • A disc - either a CD-ROM, an audio CD, a DVD or similar removable storage medium. 

  • A ring- or cup-shaped enlargement of the flower receptacle or ovary that bears nectar or, less commonly, the stamens. 

  • A type of harrow. 

  • A thin, flat, circular plate or similar object. 

  • An intervertebral disc 

verb
  • To harrow. 

  • To move towards, or operate at, zero blade pitch, orienting the propeller blades face-on to the oncoming airstream and maximising the drag generated by the propeller. 

rotary dial

noun
  • a disk with finger holes, used to enter numbers by rotating the disk forward and letting it slide back 

  • a telephone with such a disk 

adj
  • using a rotary dial, rather than push buttons 

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