Err format while recording - 1 hour lost!
I have almost the exact same problem.
I did not interrupt my recording. I stopped recording, turned off the recorder, unplugged all the mics, turned on the recorder, listened to the first 10 seconds of the recorded track, turned off the recorder, plugged it into my mac, turned it on in USB mode, attempted to transfer the track file, and the track size is "zero kb." I ejected the recorder, turned it off and back on, and now the track says "err format" and skips to the next track.
This seems like a unique problem, as any "data recovery" software will search for deleted files instead of corrupted files. And even if the file is corrupted I have software that can read the raw wav data. However, the filesize is incorrect and obviously doesn't contain any wav data. Shouldn't it be the actual file size? How can I fix this???