Sony MSXM256A PRO DUO 256 MB Memory Stick Minimum Write Speed: 15Mbps (when combined with Optimized Memory Stick PRO format-compatible devices) Flash Memory 128 MB x 2 (Total 256MB) Store, transfer and share your digital pictures, videos, music, presentations, data, voice files and more. 123 MB storage per side (for a total of 246MB) Memory Stick Interface (Serial)