Hello... Have you installed any programs recently? Like photoshop, photostudio, kodak easyshare... etc.. Installation of these programs and others will make changes to your registry which in turn could affect your drive. I recently had a similar problem and resolved it by making changes to the upper and lower filters in the registry.. By that I mean I renamed the drive upper and lower filters keys to upperfiltersold and lowerfiltersold.. You could accomplish the same thing by exporting the keys and then deleting the upper and lower filter keys..
Try this link... tells you how to make the edits to the drive filters in the registry: http://support.microsoft.com/kb/314060/en-us
Please respond it this is of any help.
Bob