I'm searching for file that mount all android partition like system,cache,etc. Why I want to do that? Because I had partitioned my SD to Fat and Ext4 and I want the Ext4 Partition as Internal SD and Fat as External SD (My device doesn't have Internal SD). I'm using Ext4 because when I search in Google "fastest file system" then the result are Ext3 and Ext4.
I have tried to edit vold.fstab but Android 4.0 or just mine doesn't support other filesystem except Fat. Then I have and idea why don't edit file that mount system or cache,etc then make my Ext4 partition as Internal SD