SD Card file is empty
I'm using my OpenBCI on a daily basis for psg eeg sleep study for about 2 months. Almost all recordings went smoothly but 2 times i got weird sd file.
When i look at start of file by using "less OBCI_89.TXT" i see this
My usual output is
Any idea on why is that happening and how to avoid it? Problem is not too big, happening like for 1 out of 50 nights, but i want to fix it.
I have 2 Cytons bought at different times and it happened at both, each one have own different sd card model, so problem doesnt look like specific to single sd card or device. All channels were good for sure, i've verified impendances and signals before starting sd card writing session. It seems that file were initialized but write to sd didnt started for some reason... Led were on for full night, so its not battery issue also.