Hi Akbar – I was in the same situation as you a few weeks back with a 16gb Sandisk. As with you, I suddenly got the media needs to be restored message and of course, it wouldn’t restore. Also, the card was not recognised by the camera. However, when I purchased the MxR adapters, I bought the usb card reader. In my case, I got the card to mount using this. However, I couldn’t copy the BPAV folder across as the formatting seemed to have got corrupted. By extracting the MP4 files individually from the BPAV folder I retrieved all the clips except for the one I was filming when I got the error. Every time I attempted to access this clip, the computer ‘hung’ which suggested a format error.
I don’t know whether you had just the one (large) clip or a series – if so (a few clips) I think that you should be ok.
Truly horrid situation, I know. I have now stopped using the SDHC cards and adapters and have splashed out on 2 Sony 16Gb SxS cards. Can’t afford the risk on a job and gives greater peace of mind.
Good luck – Martin