Here is a basic HB recording in the RECORD folder ...and the associated files in the R0000x folder ...
The R0000x folder contains the following :
B0000.IDX = data associated with 83kHz channel recording
B0000.SON = recorded 83kHz Sonar channel
B0001.IDX = data associated with 200kHz channel recording
B0001.SON = recorded 200kHz Sonar channel
B0002.IDX = data associated with left SI channel recording
B0002.SON = recorded left SI Sonar channel
B0003.IDX = data associated with right SI channel recording
B0003.SON = recorded right SI Sonar channel
Here is the HB recording files in the RECORD folder
after a waypoint is created in Humviewer ...
The XML Document and the xml.bak file are only created after a Humviewer waypoint in created ...
I have only ever seen a 0kb DAT file if the HB recording was not manually commanded to Stop Recording or if the SD Card became full before the Stop Recording was commanded ...regardless of the kb showing in the IDX or SON files ...
I think Robert knows how to get that recorded data available without the needed stuff in the DAT file ...if you want to try and contact him by PM ...
Rickie