i got this before, it was imposable to get any help from anyone at fostex, what version of software are you running? According to the info i found, error 13 means you are going to have to update the cards files, easily done at fostex site. After two weeks of searching i had finally found it. problem was my card didnt want to update, i ended up sending it to fostex and they updated it and sent it back and no problems since...... fingers crossed
dont forget after you update the software, when you start the mr 8 up for the first time , hold down the stop button, then follow the screen prompts