今天發現我從mydroid build出來的emulator一直mount 不到sdcard
最後發現 我的 /etc/沒有 vold.conf這檔案
然後就把 mydroid/development/data/etc/vold.conf  copy 到
out/target/product/generic/system/etc下
然後make systemimage  
我可以mount到sdcard了!!!
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