Today, I updated the CSSU successfully on my N900. A while later I tried using the camera and got the message - Memory not accessible. Unable to save content.

I them tried checking my files with "file manager" and found that all my directories have disappeared. I get the message - no files\folders

I also connected as mass storage mode to my computer and didn't find files or folders.

I rebooted my N900 and disconnected the battery but with no change

Can someone make a suggestion on how to remedy this siuation?