>
> Is there  a best way to mount /data ?
>

Sure. Mount it writable :-)

/data needs to be writable. So in case of ARM android, it needs to one some 
writable MTD partition. Or in case of Android-X86, it needs to be a normal 
hard disk partition. It could also be on some other media, SD-Card, 
CF-Card, usb-stick, whatever.

The Android-XL "generic_x86" targets for example creates an ISO image of a 
bootable CD. There /data is a tmpfs.

Once /data is writable, the code in /init.rc (and some android programs by 
themselfes) create the needed directories with the right permissions.

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