remount /mnt as read-write

Question

I am getting error "Read-only filesystem" when trying to add a new directory in /mnt via Terminal Emulator. So, I tried :

su
busybox mount -o remount,rw /mnt

in order to remount filesystem for /mnt as read-write; but I am getting error "can't find /mnt in /proc/mounts".

What is this error for !?

PS. My ultimate aim is to then mount an external storage on that new directory; say /mnt/myextdrive

Answer 1

Use these commands

su -c 'busybox mount -o remount,rw /'    # this will remount rootfs at / in rw mode
su -c 'mkdir /mnt/"NEW_DIR"'             # replace NEW_DIR with the name of the directory you aim to create under /mnt

Note that in Android /mnt is not a mount point for any real or pseudo-filesystem but its sub-directories are (actually, /mnt is a sub-directory of the / (rootFS), which is why you'd have to remount that to apply changes here). Also note that mnt directory in Android is created by kernel at every boot¹ so any modification would be lost after shutdown.

---

_{1: mnt doesn't exist in a persistent filesystem but in a specific ramfs named rootfs - a filesystem which exists in RAM only.}