Sony's Memory Stick is a series of small, flat, rectangular cards that contains flash memory. Designed for Sony's own brand of devices such as their camcorders, MP3 players, digital cameras. Note that there are different form factors of Memory Stick fitments such as PRO, Duo, PRO Duo, PRO-HG Duo, Micro (M2), XC.
A SmartMedia card consists of a single NAND flash chip embedded in a thin plastic card, although some higher capacity cards contain multiple, linked chips. Back in 1995 It was one of the smallest and thinnest of the early memory cards, only 0.76mm thick, Updated