android - How to list additional external storage folders (mount points)?

Question

By default, "external" storage on Android is presented as /sdcard folder. On some devices it's not SD card but internal memory.

Some devices allow attachment of additional SD card, or in case of Asus Transformer, also additional 2 USB flash discs.

Such added memory drive appears as some folder, which location depends on device manufacturer. On some devices it's inside /sdcard folder, on others it's elsewhere in other folder.

Now my question is, if there's some function to list all possible external storages besides standard /sdcard folder.

Answer 1

You can read /proc/mounts to find out what is currently mounted.

Or you can read /etc/vold.conf or /etc/vold.fstab (it depends on version what config file is present). This files contains config for removable storages. At tablet default storage is not usually present in vold.