TF card or Micro SD cards are certainly the smallest flash memory cards available.
Designed for any kind of portable electronic gadgets such as laptops, tablets, computers, MP3 players, PDAs, video game consoles, electronic keyboards, synthesizers, GPS devices, mobile phones and digital cameras.
Storage: MLC. The cards are also reusable, this gives you the flexibility of use. You can remove the content of any of the cards, perhaps from the card to a PC, and then use the extra space offered by the removal for storing other important files as well.