SD card not detected as mmcblk0

Hi,
I have a Sandisk 8GB microSD card but as I insert it in the computer it is detected as sdbbut not as mmcblk0

HI:

It’s not matter, some computer convert the SD interface to USB, if then, the SD card will be detected as sd*.

Thanks Steven,
I sorted out the problem. Now the 12.04 runs on the beagleboard. But there is another problem the interface is too slow and it cannot run audio and video files. When I checked on the angstrom audio as well as video is playing well.