Possible Solution??

I have a Sony 4 GB Memory Stick Pro Duo with Adaptor on my DSC-W7 camera and all of a sudden got this error after removing and re-installing the card. Formatted in my computer to no avail. Decided to use can of compressed air Dust-Off to blow air on the contacts and voila!! the memory stick started functioning again. I think dust particles may have been short circuiting the contacts to the camera so try this.

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