I was running CM7 build 10, had flashed it with no issues, got the gapps to finally take, had restored my apps and was selectively restoring app data. I tried to download a ringtone from Zedge and it wouldn't let me set it, so I went into File Manager and all the folders were reading empty and the files I had outside of folders were gone. I tried unmounting and remounting the SD card and that's when I got the lovely Damaged SD Card message. Tried it in Windows, no dice. Nothing I've tried to repair it has worked. Thankfully I can get a replacement fairly cheap, but it's annoying having to.