why use mmcblk's?
there are the big ones. using mmcblk's means that you are flashing to that block where teh by name it figures out where to put it for you. so flashable zips become a lot more universal as in they will should flash on the sgs3, sgs4, note 3 and many more devices.
this is about what the stock fstab looked like https://github.com/OUDhs/android_dev...recovery.fstab