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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32 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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1answer
64 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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0answers
13 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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2answers
11k views

Need absolute path to “Download” on Android 6.01

...Due to the developer / maintainer of Terminal-IDE moving on, I'm trying to find equivalent capability and after hours of research found "Terminal Emulator for Android" (which is the same app as "...
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0answers
24 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
240 views

What is the “u#_everybody” UID?

In (multi-user) Android there are UIDs like these: u0_everybody u10_everybody u11_everybody Those seem different to the usual uXX_aYY UIDs used for the applications. What is their purpose? Is this a ...
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0answers
12 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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2answers
928 views

Photos / Files / Media permission

I've seen a lot of apps that have media / files permission access requested when installing from Play Store. Does that mean they can go at my personal photos and send it back to themselves? Sorry if ...
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14 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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1answer
892 views

Replacing my default phone application with other one

Can I replace my phone.apk from system/app to a new Phone application such as Swipe Dialer Pro . will it do any harm.there is also one additional apk in system/app called phone service. Apk. what's ...
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1answer
968 views

What's the use of .tmfs folder on SD card?

What is the use of .tmfs folder on SD card? ps. there is only a file in it with Chinese filename ...
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0answers
27 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
814 views

Samsung Galaxy S4 play edition and exFat

Does the Play version of the Galaxy s4 include support for exFat in the sdcard reader? Or is exFat support one of the extras that Samsung adds to the device (presumably since they made the licencing ...
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1answer
792 views

Folder turned into file?

Normally "DCIM" is a folder in which all photos that were taken with camera are stored. When I tried to take a photo with Google Camera, the app instructed me to insert a sd card before taking photos (...
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2answers
1k views

Auto-delete certain file extensions on my phone?

How do I make my phone automatically delete certain file extensions? I'm on ICS, rooted. For example, after connecting my phone to my mac, it will leave a .trashes file and other "." folders on my SD ...
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1answer
1k views

/storage/emulated/legacy is read only

For some reason, no apps on my phone (including adb, after running su) can modify any files in any subdirectory of /storage. I also can't use my file manager on my computer to edit, create, or delete ...
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1answer
1k views

How do I mount an external disk drive formatted in ext4 via USB Host?

I plugged a 2.5 inch 1Tb drive into a Nexus 10 and I cannot see it anywhere really. Something pops up in ES File Explorer, but I cannot access the drive. Do I have to root my device, or is there some ...
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2answers
1k views

How to prevent extra folders from being created in my external SD card?

I have an HTC desire 820s running on Kitkat 4.4.4. I have set phone storage as my default write disk in Settings. However, when I open ES file explorer, I always find that many folders named like ...
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10answers
36k views

Disable USB charging

For some reasons not related to the battery life, I need to disable the battery charging when a USB host is connected to my phone (a rooted Nexus 4). Taking a look around on the internet (link1, link2)...
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1answer
22 views

File recovery on bootloader unlocked Pixel without flashing

I have a first generation Google Pixel the bootloader of which is unlocked and is running stock Pie. I need to recover deleted files on it because a move operation got effed up by ES File Explorer ...
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1answer
68 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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1answer
267 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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1answer
68 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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1answer
84 views

How to create a copy of a file immediately when it's created? [duplicate]

I have an Android app that will create a file in /data/ and immediately delete it. I want to know how can I catch this file or create a copy or even disable user permissions to delete a file? I have ...
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1answer
176 views

Why is TRIM not supported on encrypted “/data” partition?

I have a rooted Lenovo A369i. I use LagFix (fstrim) to TRIM partitions. Previously it was working well with /data but after I encrypted my phone it doesn't. I decrypted my phone by formatting. But now ...
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3answers
3k views

When should fstrim run?

Based on this cyanogenmod forum thread, I tried to address the delay in running applications and switching between applications on my Galaxy Nexus running cyanogenmod with Android 4.4.4 by running ...
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1answer
108 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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1answer
1k views

Editing personal dictionary on Android 6

As it seems Android blocks third party apps from editing the personal dictionaries for some reason. I just upgraded from Android 4 to 6 and want to import my personal dicitonary, but the apps I've ...
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1answer
1k views

How to enable pip, QPython to write to Android filesystem?

I have been following this guide to install youtube-dl on my Android phone. http://www.arulraj.net/2015/11/download-any-videos-in-android-using-youtube-dl.html However, when downloading the videos, ...
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3answers
5k views

How to force TRIM on Android device?

With 4.3 enabling the support for TRIM (though I read that it was present since the first JB). I was wondering if there is a way for me to force TRIM on my device? Is there an app that I can sideload ...
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1answer
1k views

Transfer a large file from PC to smartphone

I have a Samsung Galaxy S2, and a PC with Windows XP (I do not have WiFi). I want to transfer a 2.1 GB file from the computer to the phone. If I transfer the file as usual, I have the following error: ...
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3answers
111 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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3answers
14k views

Running TRIM from shell

Is it possible to run fstrim in stock android 4.3 from adb shell? I understand it runs every 24 hours when the device is plugged in and idle but I would like to run on demand to test a few theories.
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0answers
50 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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1answer
1k views

Why is Android 5 corrupting my SD card (moving files to LOST.DIR or losing them)?

I've been using VFAT formatted SD cards for years to transfer files between devices (tablets, cameras, GPS, computers) under different OS (Linux, Windows, Symbian, Android) without, as I recall, any ...
2
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1answer
235 views

Which part of Android directories contains so-called proprietary blobs?

When building AOSP (Android Open Source Project) or LineageOS, there is a tool named breakfast. It downloads proprietary blobs and integrates them to the source tree. I have read this article, does ...
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1answer
48 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 ...
2
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1answer
1k views

Is it possible to restrict an app's permissions to a specific folder(s) (and subfolders)?

When installing an app, depending on the app, access to the filesystem is required and requested at the time of install. Is it possible to restrict this to specific folders(s) and their subfolders? ...
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1answer
1k views

Unable to access the “mmcblk0p6” file, on Samsung S5300 Mini Pocket

I have rooted my Samsung S5300 Mini Pocket Galaxy, and I have entrie SDK installed on my Windows 7 laptop. Now via Command Prompt I am able to: adb shell $ su # <--- and get root access However,...
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1answer
2k views

Self replicating worm in sd card

I have a Samsung Galaxy Grand with a 16gb micro-sd card. For some inexplicable reason, I am losing data on the sd card. Folder names are being changed to start with the character "μ." For example, ...
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1answer
1k views

how to transfer a file from within system partition on android to desktop

background I'm developing an app that downloads files to the device.. some of these files are acting out and to trouble shoot I want to actually transfer these files to my (mac) desktop and go ...
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0answers
14 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
68 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
1k views

cannot play or copy corrupted video

I have a Samsung galaxy S4. I have changed the settings so that the pictures and video taken from the phone camera are saved in a folder on the external memory card. Usually this works quite well. ...
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2answers
767 views

How to open files copied to android file system using Adobe pdf reader

I have copied two dozen pdf's to the DCIM on the Android. How do I access them? The Adobe Reader offers the following options: My Documents - which points to a directory underneath the Adobe Reader ...
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1answer
182 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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1answer
3k views

What is the Location of Saved Images from the Facebook App?

What is the location of saved images from the Facebook app? I found this Location of saved images from Facebook Messenger app but I'm interested in photos from the Facebook app itself
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32 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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0answers
29 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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1answer
32k views

adb push not working on /system, read only

I can do adb push to /sdcard/ location but not /system on my android device. sudo adb push lib/audio.primary.gmin.so system/lib/hw/ failed to copy 'lib/audio.primary.gmin.so' to 'system/lib/hw/audio....