"CHK" (or something like that) displayed on a d80

[Chronicle]

Hi
I was shooting some photos, then all of a sudden realised nothing was happening (ie not saving them, it was like it was waiting for room in the buffer/flash to recharge, the focus etc still worked). Looked at the display on my d80 and it said (where it shows number of photos remaining) CHK, or something like that (3 letters, deff started with a C). What does this mean?

After that it said there were no photos on it. But at the moment i'm recovering them using some sandisk recovery tool, so it all seems ok. Just wondering what its about...

Cheers

 

[Chronicle]

Other memory cards are working fine.
Just realised that only a few of my photos are actually showing up in windows (none show up in the camera). So far only got about 5% of my pics, the rest are corrupt

I have rescurePRO, came with a sandisk sd card, but it isn't actually helping.Got those ~5% of my pics by just dragging the files with jpg previews in windows explorer. The corrupt ones come up with an error when i try and drag those across...