Why is my 16GB SD card not being read in my Samsung Galaxy S?
Start by reading:

xda developers >. [Help] Changing Around Mountpoints for sdcard and extSdCard?


  Excerpt: Some previous Samsung devices had no external storage at all but still mapped the biggest flash partition to /mnt/sdcard.
  The Galaxy Tab 2 7.0 has a Micro SD card slot on it (one of the reasons I bought the thing!), but I guess for compatibility they still mount an internal flash storage partition to /sdcard. The actual micro SD card gets mounted to freaking /mnt/extSdCard.




First you need to find out where it is being mounted (on Galaxy S), and whether the command you are using is for internal flash OR the microSD card ..