Default Changing sdcard to external_sd

Hi, I would like to change sdcard to external_sd with your help by modifing vold.fstab
Have some idea how to change it ?
Code:
Select Code
#LGE_CHANGE_S [jyothishre.nk@lge.com] 20120928:Adding mount for SDcard
#LGE_CHANGE_S [jyothishre.nk@lge.com] 20121031:change external_SD path
dev_mount sdcard /storage/external_SD auto /devices/platform/msm_sdcc.1/mmc_host/mmc1