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a journaling file system for Linux, and successor to ext3

27 votes
Accepted

How to recover a deleted file from /data partition on a rooted phone?

Recovery tools mostly don't need mounting filesystems but if it's required, it needs to be done on Linux PC because Windows doesn't support ext4 or f2fs natively, hence the tools aren't easily available …
Matthias Braun's user avatar
3 votes
Accepted

How to create and use multiple partitions on external SD card with different filesystems (Ex...

Surely you need ext4 (or f2fs on new devices) for this purpose (to enforce UNIX permissions). But it doesn't necessarily needs to be a partition, you can place a loop file on first partition. … If I format 1st partition with ext4, exFAT or NTFS, Android OS doesn't show it in SETTINGS > STORAGE> SDCARD > PARTITIONS and asks to mount or erase the partitions. …
Irfan Latif's user avatar
  • 21.2k
7 votes

How would you use your ext4 formatted thumb drive via OTG on Android?

GUID for that type was added in another patch in order to correctly identify ext4. … Related question is: How to read ext4 filesystem without mounting on a non-rooted device? …
Irfan Latif's user avatar
  • 21.2k
2 votes

How to read ext4 filesystem without mounting on a non-rooted device?

ext4 can be explored without mounting, using debugfs tool. But natively there is no way to access raw filesystem without root access on Android devices. … So what you are looking for is an app with third party implementation of USB OTG host APIs for ext4 filesystem. …
Irfan Latif's user avatar
  • 21.2k
2 votes

how to extend support for EXT4 file system for microSD cards in stock or non lineage / Cyano...

But precisely answering your questions: Mount multi ext4 partitioned external card at boot time, as against manual mounting which I can do Mounting external SD card is handled by vold. …
Irfan Latif's user avatar
  • 21.2k
9 votes
Accepted

Why do partitions get unmounted automatically after some time?

When I set this command to execute on boot by placing inside init.d directory in /etc, then it works normally and ext4 partition does not unmount itself automatically. … So, what is the best way to mount ext4 partition in Android persistently and what is the reason of such behavior? …
Irfan Latif's user avatar
  • 21.2k
1 vote

Does Android 8 has journaling enabled in its ext4 files sytem?

These days ext4 and f2fs are commonly used filesystems on Android, so first make sure you have ext4 on userdata partition. f2fs is by-origin a log-structured filesystem which is a circular buffer, that's … Does sdcardfs recognize the ext4 file system and journaling? …
Irfan Latif's user avatar
  • 21.2k