Have the same problem (C13:01) on my DSC-P8 with a Sony Memory Stick. Spoke to Sony tech support in The Netherlands today and they informed me that the Memory Stick was probably broken. There was nothing that could be done except return the MS to the store and invoke the warrantee (which, thank god, hasn't yet elapsed).
P.S. I tried formatting the MS with my computer, but that did not work. Fortunately I had already uploaded my pics. My advise to all would be: make sure you upload your pics to your computer on a regular basis!
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