Sony Corporation announced in September, 2005, that in cooperation with SanDisk Corporation will start the development of the third form factor memory card in the Memory Stick family, after Memory Stick PRO and Memory Stick PRO Duo. The new much smaller, among the smallest on the market, Memory Stick Micro will have about one-fourth the size of Memory Stick Duo.
Memory Stick Micro or M2 will be introduced in the first half of 2006 and is aiming to be used mostly in mobile phones and ultra small portable devices.