I have an app that looks for videos in a specific folder: “videos”. I'm trying to get my FAT flash drive to mount on the folder videos under /sdcard internal storage.
Nexus 6 (no SD card slot)
LineageOS 16
(Android 9)
Tried:
~$ su -mm
~# mount -o bind /mnt/sdcard/videos /mnt/media_rw/A064A9EB64A9C3FE
Did not work and editing the fstab file does not save after reboot.
Android fstab file:
# The filesystem that contains the filesystem checker binary (typically /system) cannot
# specify MF_CHECK, and must come before any filesystems that do specify MF_CHECK
#
# NOTE: /system partition is now early-mounted and the fstab entry is specified in device tree (duplicated below for recovery image purposes only):
#<src> <mnt_point> <type> <mnt_flags and options> <fs_mgr_flags>
/dev/block/platform/msm_sdcc.1/by-name/system /system ext4 ro,barrier=1 wait,recoveryonly
/dev/block/platform/msm_sdcc.1/by-name/userdata /data ext4 rw,nosuid,nodev,noatime,noauto_da_alloc,nobarrier wait,check,formattable,latemount,encryptable=/dev/block/platform/msm_sdcc.1/by-name/metadata,reservedsize=128M
/dev/block/platform/msm_sdcc.1/by-name/userdata /data f2fs rw,nosuid,nodev,noatime,inline_xattr wait,formattable,latemount,encryptable=/dev/block/platform/msm_sdcc.1/by-name/metadata,reservedsize=128M
/dev/block/platform/msm_sdcc.1/by-name/cache /cache ext4 rw,noatime,nosuid,nodev,barrier=1,data=ordered wait,check,formattable
/dev/block/platform/msm_sdcc.1/by-name/cache /cache f2fs rw,nosuid,nodev,noatime,inline_xattr wait,check,formattable
/dev/block/platform/msm_sdcc.1/by-name/modem /firmware ext4 ro,barrier=1,context=u:object_r:firmware_file:s0 wait
/dev/block/platform/msm_sdcc.1/by-name/persist /persist ext4 rw,nosuid,nodev,noatime,barrier=1 wait,check,notrim
/dev/block/platform/msm_sdcc.1/by-name/boot /boot emmc defaults defaults
/dev/block/platform/msm_sdcc.1/by-name/recovery /recovery emmc defaults defaults
/dev/block/platform/msm_sdcc.1/by-name/misc /misc emmc defaults defaults
/dev/block/platform/msm_sdcc.1/by-name/modem /modem emmc defaults defaults
/dev/block/platform/msm_sdcc.1/by-name/mdm1m9kefs1 /mdm1m9kefs1 emmc defaults defaults
/dev/block/platform/msm_sdcc.1/by-name/mdm1m9kefs2 /mdm1m9kefs2 emmc defaults defaults
/dev/block/platform/msm_sdcc.1/by-name/mdm1m9kefs3 /mdm1m9kefs3 emmc defaults defaults
/dev/block/platform/msm_sdcc.1/by-name/sbl1 /sbl1 emmc defaults defaults
/dev/block/platform/msm_sdcc.1/by-name/tz /tz emmc defaults defaults
/dev/block/platform/msm_sdcc.1/by-name/rpm /rpm emmc defaults defaults
/dev/block/platform/msm_sdcc.1/by-name/sdi /sdi emmc defaults defaults
/dev/block/platform/msm_sdcc.1/by-name/aboot /aboot emmc defaults defaults
/dev/block/platform/msm_sdcc.1/by-name/versions /versions emmc defaults defaults
/dev/block/platform/msm_sdcc.1/by-name/logo /logo emmc defaults defaults
/dev/block/platform/msm_sdcc.1/by-name/frp /persistent emmc defaults defaults
/devices/*/xhci-hcd.0.auto/usb* auto auto defaults voldmanaged=usb:auto
/dev/block/zram0 none swap defaults zramsize=536870912,notrim,max_comp_streams=4
Hard to find info on Android mounting system. These are what I have found:
How to bind-mount "data" and "obb" folders from external SD card in "/sdcard/Android"?
How can I make a symlink (or equivalent) inside /storage/emulated/0?
- Let's clear up the confusion regarding storage in Android once and for all, including adoptable storage in Marshmallow.
- How the Mount SD Card Android Process works
mountcommand takes source first, then the target. You are doing it inverse. It should be:mount -o bind /mnt/media_rw/A064A9EB64A9C3FE /mnt/sdcard/videos. But that won't work either because apps don't have direct access to USB OTG drives. Also there are mount namespaces involved. Explained here: android.stackexchange.com/a/218338/218526