FolderMount or other means to mount external SD dirs on internal /sdcard

[uta8111]

There seems to be quite a bit of discussion about this but no real resolution. I've been trying to find a way to mount directories on my external SD card onto the internal /sdcard directories to force apps that only can write to /sdcard internally to actually write to the external card. What a mess. I've tried symbolic links, battled the FUSE mounts, experimented with "mount -o bind" -- on and on. FolderMount claims to do such things, but bricks the phone.

I can do the bind mounts -- and when I look at them with adb they appear to be correct. But the apps continue to write to the internal /sdcard dirs. I've also turned off SuperSu mount namespace separation in testing.

It's a shame that something that really should be so simple is such a PITA. Any new ideas? Thanks!

 

[jgammon1979]

Why don't you use ADB and partition your SD card as internal storage. Samsung took out the adoptable storage feature for Marshmallow. For the workaround go here:

http://forum.xda-developers.com/galaxy-s7/how-to/enable-adoptable-storage-s7-t3333511

 

[uta8111]

I considered that early on. The problem is that I've never seen a reasonable explanation of how "bonded" memory like that is handled. Right now I have a 64GB card split as one exFAT and one ext2 partition (the latter for link2sd, and mostly empty). But at least this lets me have some control over where apps end up. But if I bond ("adaptable") an SD card partition to the internal memory, I (AFAIK) lose that control. Any given app and app's data could end up on faster internal memory or slower external memory, and I wouldn't be able to control it. Also, at this point wiping the phone to do this would be a serious PITA. Am I missing something? Thanks!

 

[jgammon1979]

Actually, you can partition part of the SD card as internal and part of it can remain external using the ADB method. I have a 64GB card myself, and it works great. I would recommend a high speed one though.