At first, thanks for advice BogusTrumper...
I did what you told me to.
I greped something, but nothing, that could be my card. I entered ls -l /dev | grep "2007-06-06" | grep "23:" and got only "ptmx", "tty" and "xconsole".
Sometimes I got also "mmcblk0" and at first I thought It might be my card, but I did not get it always I used this grep, so it won't be what I'm looking for I guess.
I'm using micro SD with SD reduction, I hope it's not the problem. I don't have any SD card with me. I can get XD. But I suppose, that it's not the problem, that I'm using card with reduction.
Thanks one more time for your reply.