Sometimes Android smartphones fail to recognize the OTG device due to an incorrect file format. To solve the issue, try switching to a better file manager app that uses more sophisticated algorithms to connect and read the OTG connected device file systems! ES File Explorer could be the better choice in this case, the root accessibility would unfold the more complex functions to work on your connected storage or OTG peripherals. Your device’s software would fail to recognize the file format system of the attached peripheral. Although the reliable accessories from renowned manufacturers are a bit more expensive seriously, these are more technically rock hard! 3) Use ES File Explorer The cheap ones could probably cause you the issue, and there could be no chance to fix that up. You should try to use up all the accessories or attach peripherals manufactured by renowned and reliable companies like the Sandisk. While it's theoretically possible and there exist solutions like open-source libaums (for FAT32) and closed-source like Paragon's (for exFAT/NTFS), I don't know of any stable working solution for ext4 at the moment.The solution here is the only way. Filesystem type might also needed to be changed in fstab if it's not auto (particularly on Android 5 and before).Īnother way to access ext4 formatted USB stick on non-rooted devices is through USB host mass storage APIs. This patched vold is also available as a Magisk module vold-posix, or you can build yourself from source code to manually add it to /system. GUID for that type was added in another patch in order to correctly identify ext4. Going Android-ish way, many custom ROMs include a patched vold which can handle NTFS, ext4 and f2fs filesystems, as well as Linux ( 0x83) partition type. Neither you can manage the mounted storage from device Settings. But this way Android framework is unaware of mounted filesystem and Android apps won't be notified of new storage. Use sdcardfs or FUSE to emulate the filesystem for fixed permissions. With root access you can manually mount ext4 filesystem (on USB stick or SD card) with proper permissions (after vold fails) and read/write files there. For details see How to save files to external SD card? But it's writable only through Storage Access Framework APIs. Public volume (secondary external storage) is not directly accessible to apps or readable as emulated filesystem. ext4 and f2fs are supported only for private volumes (Adoptable Storage).
External SD cards and USB OTG drives (since Android 6) are handled by vold which supports only FAT ( vfat) and exFAT ( since Android 9 provided that OEM adds support to kernel) filesystems on stock Android.
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