pen drive vs picture card

pen drive

noun
  • A small electronic device used to store digital data, more portable and robust than a hard drive; a flash drive. 

picture card

noun
  • A flash memory card for a digital camera. 

  • A playing card which has a picture on it (usually Jack, Queen or King (coat card), but sometimes including Ace or Joker). 

  • A trading card/trade card. 

How often have the words pen drive and picture card occurred in a corpus of books? (source: Google Ngram Viewer )