In Tom Frank's post #3 he says that if you are recording and the camera runs out of battery, your file is lost. This is incorrect. When I was using my two 808 #3s if you are recording and the camera runs out of battery... the file isn't shown, but is HIDDEN. It can be recovered by using the error checking tool in windows. You still have to mess with a Hex editor to append the header onto the video part... but after you do it it works correctly. Make sure you turn on hidden files.
A tutorial of this can be found on Chuck Lohr's website (http://www.chucklohr.com/808/#RecoverZeroLengthAviFiles
The reason I bring this up is because I am having the same zero length video file issue with my 808 #11 HD, but I am unable to find the header (atleast I gave up after line 70000).
Anyone have any fixes?