Read-Only and Read-Write in Android File System

If you try to create any folder or push any file using ADB to android file systems like /system and if it is mounted as Read-Only then it may shows error code like “failed to copy files to ‘/system/lib//cfg80211.ko’: Read-only file system. In this case you nee,d to remount it as Read-Write(RW). Below are the commands for this.

• For re-mounting as read-write,

$ mount -o rw,remount /system

• For remounting root, //will be used for pushing init.rc files in /root

$ mount -o rw,remount /

• For re-mounting as read-only after while

$ mount -o ro,remount /system 

• Or you can use adb tool to remount it as R/W

$ adb remount