大神求助！急！！ miuiv5 双卡版 如何设置外置SD卡为默认存储

wangbai1.hi

RT 双卡版的v5很完美 但是原本设置中默认存储的设置却没有了
于是我动手修改了vold.fstab文件

## Vold 2.0 Generic fstab

## - San Mehat (san@android.com)

##

#######################

## Regular device mount

##

## Format: dev_mount <label> <mount_point> <part> <sysfs_path1...>

## label        - Label for the volume

## mount_point  - Where the volume will be mounted

## part         - Partition # (1 based), or 'auto' for first usable partition.

## <sysfs_path> - List of sysfs paths to source devices

######################

## Example of a standard sdcard mount for the emulator / Dream

# Mounts the first usable partition of the specified device

dev_mount sdcard /storage/sdcard0 emmc@fat /devices/platform/goldfish_mmc.0 /devices/platform/mtk-msdc.0/mmc_host

dev_mount sdcard2 /storage/sdcard1 auto /devices/platform/goldfish_mmc.1 /devices/platform/mtk-msdc.1/mmc_host

#lenovo.sw : add otg device mount

dev_mount usbotg /mnt/usbotg auto /devices/platform/mt_usb/usb1/sda

dev_mount usbotg1 /mnt/usbotg1 auto /devices/platform/mt_usb/usb1/sdb

#lenovo.sw : end

## Example of a dual card setup

# dev_mount left_sdcard  /mnt/sdcard1  auto /devices/platform/goldfish_mmc.0 /devices/platform/mtk-sd.0/mmc_host/mmc0

# dev_mount right_sdcard /mnt/sdcard2  auto /devices/platform/goldfish_mmc.1 /devices/platform/mtk-sd.2/mmc_host/mmc2

## Example of specifying a specific partition for mounts

# dev_mount sdcard /mnt/sdcard 2 /devices/platform/goldfish_mmc.0 /devices/platform/msm_sdcc.2/mmc_host/mmc1

如上，将红字部分互换，可是重启后没有任何效果 求大神解答怎么回事
十分感谢！！！！！！