Here's another solution for the C:13:01 error. I also had this problem, but now I know what it is. I have a Sony Cybershot F707 camera with a Sony 256 Memorystick PRO. If you use this stick in this camera you'll get the C:13:01 error, because this camera don't support Memorystick PRO, only Memorystick. When you try another Memorystick (not a Pro-version) the camera will just work fine. And when you try the Memorystick PRO in a F717 for example (this camera supports Memorystick PRO), the Memorystick Pro also will work just fine.
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