Where did my files go?

I decided to make a second backup of files I took back in January on my first SD card which is also the largest (32GB), however the card didn't show up when inserted into my MacBook Pro's card slot.

Even more worrying is that when inserted back into the camera (Panasonic AVHMC 152) apart from one file they all show up as clear empty thumbnail frames with a little red exclamation mark inside.

When the camera is connected to the laptop I can see in the STREAM folder that I have files 00567.MTS to 00664.MTS and there should be a huge bunch more between that. Where are shots 00001 to 00566???

I know I have not deleted anything and I haven't reformatted it.

Also, I am using the Wondershare Video Converter to randomly pick a clip and see what it is by dragging it into the conversion window but is there a better way of viewing clips individually before using them?

I want to make a showreel next month without having to log and transfer entire folders for the sake of one or two special clips.

I've just copied the contents onto my external terrabyte and to my relief it was copying 15.52GB of data which is the mass I would have expected. The copy took about twenty minutes, however when done - there was nothing at all in the new folder I had assigned on my hard drive.

Lock the card so it can't be written to, and use some card recovery software. The data seems to still be there, but the directory may be corrupt.

It's definitely the card, I've re-installed FCP and the Apple store say there's no issue with the software. Perhaps it's because I changed the name of the SD card file from 'PRIVATE' to 'PRIVATE SD#2' - but I had to, because otherwise it would have asked me if I wanted to replace the existing 'PRIVATE' folder.

I have not solved this issue but to continue this edit I will have to convert the raw files in Wondershare video converter and use Quicktime versions. It's for a website video so the difference should be un-noticable to the client.

I have no idea what setting to convert in so I just went for the the highest which was 1280 x 720 and slide up to max quality.