Introduced in 1998 with 4MB and 8MB capacities, the original 2" modules looked like a short stick of chewing gum. Sony also designed Memory Sticks ... change was the Duo format, which is half ...

It measures 21.5 mm x 50 mm Memory Stick Pro™ Memory Stick Pro™ has faster specifications then the regular Sony Memory Stick. Memory Stick Duo™ The Sony Memory Stick Duo™ measures 31 mm x 20 mm x 1.6 ...