%       * is a card is inserted?

In regard to the Daisy card, we do not have plans to sell it separately from the 16 channel R&D kit. 

for the SD card slot, please go to the hardware documentation page

Finally any advice on the microSD card slot?

Though maybe a short form board if one is not interested in transmitting the data via Bluetooth, or not interested in logging the data to an SD card.

Thanks @chipaudette !!We had only 50€ budget for the entire thing, but I found an extremely cheap external 7.1 surround card that works quite well (for the purpose of driving the tiny crappy speakers)

The use of multiple speakers for the multiple EEG channels is a good idea.  How did you get multiple audio streams for the differetn speakers?  Did you have a multi-channel sound card for your compute

http://docs.openbci.com/tutorials/05-SD_Card

Also, I was wondering if there was some sort of explanation of how the raw data is saved in the SD card while using the OpenBCI (what bytes correspond to what electrode, how frequently the acceleromet

I don't have an OpenBCI board (yet), I'm just experimenting with the software till I get the board. I'm on synthetic data mode. Maybe that's different? My PC is a Dell Inspiron: i3 3rd generation proc

How can I fix this? Is this normal? Is this going to affect the resolution of the readings on my OpenBCI SD card?

* OpenBCI Function: SC card SS

Some of the parts we used for production were supplied by our manufacturer (SD card slot, all the discreet passives) so we don't have part numbers for them handy. 

That is one of the reasons for adding the SD card slot, for local raw data storage. 

Removing the SD card library and all of that code will bring the code size down to 12.5Kb. Still abit too fat to fit on the 8bit board.

The SD card write speed is determined by the SPI clock speed. SD cards are not really SPI devices, but they can be tricked into it. The 32bit boards use two different clock speeds. 20MHz when talking

The BOM seems to be incomplete and sometimes the part number is wrong. Also I cannot find some parts at all like the microsd card connector. Examples: CAY16-F4 is just the series the correct part  num

through the SD card to conserve bandwidth on the wireless link, but I am not

* is a card is inserted?

You should definitely not need an SD card to stream. Which board are you using? Do you get the same error when running test.py? (also in github)