Dream, It looks like you have a valid BDF file? I don't quite understand the title of this thread, "BDF+ to SD Card Error". Can you explain why you chose this phrasing? Is not the issue you

Its there in all its glory the large file but I cant select it for playback and it doesnt appear on my SD card...

[original thread title: "BDF+ to SD Card Error", see comments below.]

I'm thinking about designing my own board based on the ganglion schematics/layout. I'm really just looking for the lowest-cost solution for a scalable system. I'm planning to cut out the SD card/accel

Before starting a session, select the option to save data to SD card from the GUI Control Panel. You will see this after selecting the Cyton as a data source.

I was recording OK cython data on a SD card on windows XP (!) with OpenBCI-GUI V 2.0.0 (2017).

https://www.tindie.com/products/land_boards/4-channel-opto-isolator-card-optosmall/

It may be possible to sample at higher rates to the SD card, but here again, there are limitations involving SD card buffering and write speeds.

The SD card commands are documented here,

I'm Looking for the setting that enables me to extend sample collection from 1 hr to SD to the desired duration.

https://openbci.com/forum/index.php?p=/discussion/1642/cannot-get-500-or-1000-hz-sample-rate-from-wifi-shield-or-sd-card

I want to reprogram the switch for power on/off so that I can use BLE/PC to control start/stop recording data on the SD card. I can try to change the hardware if needed. Any idea on how I should do th

I'm trying to locate the directory to which the raw output file is saved - the documentation says it is in the same directory as the GUI however I do not see it. Is there a direct path? Does it need t

* Should I have gone with the 8 Channel Cyton to allocate money to a device I can wear while recording in a sleep state? My credit card bills are prettying high right now.

Yes. Existing SD card playback code in GUI 5.0.1 looks for the number of columns to determine if 8ch or 16ch are present in file.

Hardest and not a good idea: Modify Cyton Firmware SD Card File Code and GUI for all users.. Requires firmware update... Could brick hardware!!!

The SD card conversion in GUI v4 might be hardcoded to 250Hz for 8ch and 125Hz for 16ch. Try @wjcroft's suggestion.

The SD card conversion in GUI v4 might be hardcoded to 250Hz for 8ch and 125Hz for 16ch. Try @wjcroft's suggestion.

https://openbci.com/forum/index.php?p=/discussion/2435/over-250-sps-to-sd-card-using-bluetooth-dongle

Thanks for your replying! The reason why the glitch happening might be the speed of SD card writing is not fast enough. I have re-flash my board for tons of times. It seems like not the uploaded probl