Bad bad bad Sony, you make me scream PROPRIETY!
Sony release its own propriety memory card a long time ago called a memory stick. This has gotten a lot of talk from PC people and anyone in the scene. Well they have started improving the memory stick techmology and now... *poof* it is not compatable with older systems. They have just magically taken you and made you dissapear from the user group making you spend more money in the every growing Sony propriety technology. Way to go Sony. Read more here