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I was using a brand new 16GB SDHC card in my Nikon D80 and after about 30 photos, the camera no longer recognized the card and asked if i wanted to format (i chose NO). I believe the D80 formats the card using FAT32, which is how i formatted the card prior to taking pictures. When I insert the card into my Mac, it recognizes the card, but can't read it and asks if I want to initialize it (again, I chose NO).

I'm trying to use PhotoRec to try to recover the photos, and so far it hasn't found anything, though I'm not 100% sure I'm using the software correctly.

The questions I have are:
1) PhotoRec lists two cards, labeled disk2 and rdisk2. Both show as 16GB. Which one do I choose?
2) In the Options, I've tried Expert Mode and selected the 512 byte block size, but still nothing. Should I change the settings for Paranoid and Keep Corrupted Files?
3) If the filesystem is bad, can I format the card in-camera to reset the format and still recover any files?

Any help would be appreciated!

Quick update:

I tried formatting the card in-camera, and it didn't work. I then tried to format using Disk Utility on my iMac and still nothing. After doing some research, it looks like the disk appears, but there are no volumes to mount and access.

Does anyone know how I can repair the volume and (hopefully) access the data?

spaceman1179 wrote: 1) PhotoRec lists two cards, labeled disk2 and rdisk2. Both show as 16GB. Which one do I choose?
2) In the Options, I've tried Expert Mode and selected the 512 byte block size, but still nothing. Should I change the settings for Paranoid and Keep Corrupted Files?
3) If the filesystem is bad, can I format the card in-camera to reset the format and still recover any files?

1) rdisk2 is recommanded, but disk2 is also fine
2) There is no real need to change the other settings. You can anyway set Keep Corrupted Files to Yes, if you get no good files (names like f*.jpg) or broken ones (names like b*.jpg), there is a physical problem on the card
3) Reformating the card is a bad idea, more information will be lost. If it's already done, you have to force the block size to 512 bytes.