Questions tagged [file-system]

A file system is the logical structure to organize (store, retrieve and update) data on a storage device.

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17 views

Where Firefox for Android is keeping add-on generated files?

I want to find a folder, where Firefox for Android is keeping files generated by installed add-ons (list of saved tabs in OneTab, for example). I've tried to do a full root file system search (e.g. ...
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42 views

How to create filesystem in TWRP? Getting error: “Unable to format to remove encryption”

The screen appears after booting into TWRP and trying to format memory: I was trying to flash a custom ROM using TWRP recovery but it's showing Unable to mount storage & Failed to mount '/data' (...
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28 views

How to permanenlty disable mobile data by renaming or editing files or directories on rooted-device?

Yes, I read the answers to the question by the link Disable mobile data permanently but I'm interested in a solution related with directories and files on rooted-device and not in using an application ...
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37 views

Monitor and identify which apps create a specific file/directory

From time to time, there is a directory (and files inside of it) that is created on the internal memory of my device. I keep deleting it, but after a few days/weeks, it's back. The folder in question, ...
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14 views

How to move files from regular account to work account on android 10?

I've researched and I cant find anything. What I am missing?
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31 views

/system/media Directory

First of all, I am currently learning about Android security and wasn't sure if to post it on the Android or Security StackExchange, either way here is my problem... Investigating the content ...
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154 views

How to create and use multiple partitions on external SD card with different filesystems (Ext4, exFAT, NTFS)?

I want to create 4 partitions on external MicroSDcard through ADB shell commands, not on Windows or Linux. Also want to show all partitions in Android GUI (SETTINGS > STORAGE > SDCARD) and make them ...
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1answer
32 views

How to move 7GB ext4 partition on external SD card to 30GB partition on another SD card?

I had rooted my Android Lollipop 5.1.1 phone and installed Link2SD and linked installed apps on ext4 7GB 2nd partition of external SD card of 16GB size . The apps installed occupied 6.5GB space and I ...
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92 views

How to erase unsued space so that dumping userdata partition creates a sparse file of small size?

When I create a gzip image of userdata partition (/dev/block/mmcblk0p29) it creates huge 6.8GB image, previously it was 350MB. Is it possible through command-line to erase or wipe or delete space on ...
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47 views

How does Android treat files bigger than free space remaining while recording?

I've spent the entire day trying to solve this issue, it seems paranormal but (sadly) it's true and I didn't find a way to solve it. Yesterday I recorded a very important video using my Xiaomi and ...
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82 views

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

I perfectly know it is not possible to mount an ext4 partition from a USB key without root. But in my case, I just need to read a password inside a .txt file (I don't have a PC right now and in the ...
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Create a link to a folder on homescreen with native filemanager on Android 9

I want to create a link to a folder that's on my sd-card. However if I long press on the native file-manager the only link it offers to open up directly is the images-folder, wich I then could drag to ...
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57 views

Recovering files from Android phone without usb port working and without root

I need to recover deleted files from samsung android phone but it have damaged usb port and no root privs. Is there a way to achive this? I thought about cloning the internal storage to SDcard or via ...
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30 views

File showing on device not showing on computer

I'm developing an Android application where some data is exported in a json file written in the Download folder. My objective is to get this file from a computer (when the device is USB connected). ...
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2answers
96 views

How to create a shortcut to some file in another folder?

I have a PDF on the folder ExtSD/Documents/. I need to make a shortcut of this file to the folder ExtSD/CurrentlyReading/. So simple on Windows... Apparently never asked on Android. If it's of any ...
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20 views

Access “downloads” folder within internal storage [duplicate]

I can see files within the "downloads" folder in internal storage on my LG V35 ThinQ phone. I cannot see these files from my Windows PC (phone connected to PC in USB storage mode). If I try to move ...
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53 views

How do I search the SD card with standard Android File Explorers?

My Android Pie SD card storage looks like this: . ├── Android | ├──data | | ├── com.amazon.mShop.android.shopping | | | └── ... | | ├── com.amazon.venezia | | | └── ... | | ├── ...
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93 views

Why bowsers cannot download files to storage (path looks /dev/null/Download)?

The phone is Samsung Galaxy Note N7000. For the last few years I use NightOwl custom rom (Android 7). I do not remember when I faced with this problem, maybe after repartitioning with REPIT (but ...
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1answer
20 views

I don't know how these files got in my photos

I get photos saved in a folder named files, I don't know the people in the pictures . there not photos I took ! How could they have gotten into my phone? and details show /storage/emulated/0/Android/...
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60 views

My SD Card gets corrupted every time my phone reboots or shuts down

I have a 32GB SD card, however, every time I mount it into my phone (Huawei Y5II), it shows a message that the SD card is corrupted and I should reformat it. I backed up my files to my PC, and ...
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68 views

Can disk quotas be disabled?

$ cp a b Cannot write to 'b' (Quota exceeded). # df -h . Filesystem Size Used Avail Use% Mounted on /data/media 110G 102G 7.8G 93% /storage/emulated I can copy the file perfectly fine in ...
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Is it safe to delete the Android “.HiddenCabinet” folder?

I wish to remove the entire Hidden Cabinet (".HiddenCabinet") directory tree and all its components. Is it safe to simply delete that folder without disrupting the rest of the file system? Are there ...
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71 views

How to recover unsaved video file on Android?

I've got a Samsung S9 phone and today I was taking a lot of photos and videos. For one video we pushed record for about 30 seconds and then pushed stop. It appeared to have been recorded. However, ...
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32 views

Unable to copy the files to /system/app

I am working on i.MX 6Quad SABRE-SD with Android 9. I am facing some problem when copy the some data to system/app from USB Mass Storage, I got error, when I mount the system to write access: ...
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177 views

What is default “fstab” file in Android?

As I known, in Android 9, system and vendor are mounted in the first stage of init by parsing fstab from device tree. But, there is another fstab parsed in init process, it is device default fstab, ...
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55 views

Explore files using Android Studio

Is it possible browsing the device filesystem with the current version of AS? I've read that in the menu View > Tool Windows > Device File Explorer there should be the suitable tool, but I cannot see ...
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24 views

How does Windows interact with Android Internal Storage?

I have a simple question which I can't find the answer for We all know that Microsoft Windows doesn't support partition formats such as ext4 or f2fs, however even this being the case, how can it ...
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24 views

In which Android system file can I remove Wi-Fi password field?

If I would root my device based on Android (v4.0.4), which system file and how can I change to remove from the graphic interface the field where we manually type a password when connecting to new Wi-...
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3k views

How to unpack/repack system.img of android ROM?

I have OnePlus 6T device which has A/B partition system and has a ROM of user type i.e [ro.build.type]: [user]. This device is rooted with Magisk. I have a requirement(Want to place customized ...
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1answer
4k views

How to disable dm-verity on Android with “user” build type ROM?

I have One Plus 6T Android device which has a ROM of build type user. This device is rooted with Magisk and I want to disable dm-verity on this device. I have tried to run adb disable-verity but I got ...
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29 views

Camera folder displayed as empty, but contains 20GB data

My Lenovo Moto G5 Plus' internal storage ran full, and now there appears to be a problem with the photos that are saved on its internal storage. The internal DCIM/Camera folder is displayed as empty ...
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21 views

In Android 8, during video recording, how the data is saved to disk?

In Android 8, during long video recording, 1) how often does the recorded video data is written to internal storage? 2) What is the size of each piece of data written? 3) Is the data stored ...
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143 views

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

Android 8 uses stackable file sytem called sdcardfs, which emulates FAT32 on ext4 on the data partition. Does sdcardfs recognize the ext4 file system and journaling? In other words, files written ...
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40 views

2 folders of same name in internal storage of Oneplus3

Currently on my phone, i have 2 folders of the same name. The content of both folder shows 0 bytes. EDIT : They are exactly the same. And the subfolders and files are also same with 0 bytes content. ...
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1answer
4k views

TWRP unable to wipe or format `Failed to mount '/system' (Device or resource busy)`

I'm trying to install LineageOS and then GAPPS on my Pixel XL from TWRP recovery. I'll try to Advance Wipe the /systems directory and Format Data, but I continue to get multiple errors: Failed to ...
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200 views

How to identify the app/process which re-mounts partitions R/W, creates files and changes file permissions?

I have a rooted device, with superuser rights granted to a few apps I trust. I have often found my /system or /vendor partition mounted read/write, and some files chmoded to 0777. Similarly ...
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389 views

How to change random filesystem label on USB OTG?

I am without PC right now, but I need to Format USB Drive (to FAT32 or Ext4) with Samsung S8 (Android 9) and change label. But I can't find any app that can do this. I can format USB drive in Storage ...
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1answer
408 views

How can I know if fstrim was run when I put my phone on charging over night?

Is there any logging where I can confirm this?
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295 views

Why deleting system files on a rooted Android says “device or resource is busy”?

I have FX Explorer, I was trying to delete some stuff in /system/app (the stuff are just empty folders) but it keep saying The operation isn't permitted on a mounted filesystem. What should I do to ...
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15 views

Save doc to same location it was opened

I am looking for an Android word processor that does one thing ( aside from the usual editing and formatting). When I go to save a document, I want that document saved exactly in the same spot that I ...
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2answers
492 views

Getting signature error while installing a different version of the app

Recently I install a custom ROM named eelo https://e.foundation/. It comes with pre-installed Telegram app. After much research I was able to uninstall if from the system with the command adb shell pm ...
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1answer
306 views

If I reset my phone, will it also TRIM the fragmented eMMC?

I know that Android supports fstrim but it only works if the phone is idle for a long time while charging. I think my phone is too fragmented and is lacking performance so I want to reset it but I am ...
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51 views

An app on the play store promises to TRIM without root access but I highly doubt if it even works [duplicate]

My phone is new so I can't root it because I don't wanna void my warranty just yet and trimming my phone would also not make a significant difference. Since most other apps on the Play Store promise ...
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3answers
437 views

This app promises to run “fstrim” without root but I am not sure if it works

I am not sure if this app works. Can someone please help me? My phone is new and in its warranty period so I can't root it yet. I tried this app but I am not sure if it actually did something. Unlike ...
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1k views

How can I enable last_kmsg?

I'm trying to diagnose a random reboot on LineageOS 14. last_kmsg is not in /proc, nor it is in /sys/fs/pstore/console-ramoops. EDIT: ~# mount | grep PSTORE ~# mkdir /mnt/pstore && mount ...
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43 views

Can I get the account details or logged details of an application from the data / file system directory of phone?

Can i get the account details or logged details of an application from the data file of the application in the file system. My device is rooted. For example I have two Instagram accounts saved in the ...
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41 views

How to delete app remnants without root privileges?

I installed Chrooma Keyboard on an Android Nougat device. It worked fine, including swiping to enter text. After adjusting Chrooma's settings several times, it started to have a problem where ...
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30 views

Corrupt filesystem - only able to boot from external SD card

So I have a Samsung Galaxy J5 SM-J500F which suddenly refused to boot in any way (normal, recovery, download). I booted TWRP from external SD card but it shows Internal Storage (0 MB). Can't mount or ...
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23 views

How do I find and delete lost encrypted files?

I used the Asus File Manager app hidden cabinet feature to store files. Now the app crashes whenever I open it. The files being gone is a conclusion I've come to accept, but I would like to delete the ...
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40 views

Track files created/read by a certain app

I want to monitor a system app, say "S1." In particular, I want to know what files S1 is accessing/reading. S1 can also download files over the Internet and save them in the root of the system. I ...