http://wl500g.info/showpost.php?p=60930&postcount=1
since you moved from kernel 2.4 to 2.6 the disc names have changed and thus you need to change your configuration (fstab) to make it work.November 2011
rtn firmware with kernel 2.6 instead of kernel 2.4 uses disca, discb etc.
you have to replace all occurances of "disc0" with "disca" in this tutorial!!!!
I will update the tutorial if i have time for it.