Photron FASTCAM Multi Hardware Manual page 63

So, if you need to save all the frames with waveform data to the FAST Drive, add one frame in the end
of selected sequence and save it.
Example)
th th
To save the image data with waveforms in the sequence starting at the 5 frame and ends in the 20
th st
frame; Select sequence from the 5 frame to 21 frame.
49 FASTCAM Multi Hardware Manual