34
I usually use a combination of the following 4 commands and correlate them, since each of these commands gives a piece of the information that might be needed.
Summarily:
Using df lists the filesystem path alias and size info as seen below (total size, used, free and block size)
Example output:
root@ks01lte:/sdcard # df
df
Filesystem ...
30
There is no singularly defined "Android" filesystem, so this can vary between devices. Any FS that the kernel can load drivers for is basically fair game.
By and large, you'll almost certainly find that ext4 is the most common filesystem on modern devices. Older devices may use older ext* versions as well, or other filesystems entirely. Since everything is ...
25
Some major changes occurred to storage in Android 4.4 (see Android's Storage Journey). So the following is generally true for Android 4.4+ and particularly 6+.
This is from my detailed answer to How disk space is used on Android device?. Apps' files are saved (by system and app itself) to internal and external storage under different categories.
DIRECTORY ...
21
This is a known issue. Go to app manager and find 'external storage' and 'media storage' and clear data and cache for them, then reboot, and wait up to 10 minutes and then connect to PC via USB.
Sometimes media scan apps from play store help if you don't want to reboot.
19
The answer to your question is built into your phone's OS.
1. Put the SD card in your phone
2. Reformat the SD card with your phone(Settings --> Storage/Storage & USB)
3. The file system on the freshly formatted SD card is the type that will give you the best performance with your phone.
4. Outside the context of your phone the optimum file system is ...
16
The sequence of commands that worked for me was
adb root
adb disable-verity
adb reboot
adb root
adb remount
If I don't reboot, remount does not succeed.
15
The solution was to reboot the phone. The com.fsck.k9 directory is now visible on the top level of the phones file system.
14
The syntax of mount command usually requires you specify the target:
mount -o remount,rw /system /system
This output could be useful for us to better understand your problem:
cat /proc/mounts
As a last resort, as you have root you can try saving raw image of system, mount it on your box and push the app there, then flash it back on your device. To save ...
12
I'm going to give a general overview of how dm-verity and related things work on Android according to my limited knowledge. Situation might differ on different devices and ROMs.
HOW IS DM-VERITY ENFORCED?
dm-verity (Verified Boot and AVB) as well as dm-crypt (FDE) are targets of device-mapper feature of Linux kernel. dm-verity verifies the integrity of ...
11
The Android system does not have the conventional /etc/passwd storage for users and groups. In android, user and groups are used to isolate processes and grant permissions. The Android system creates a user per application when an application gets installed. Hence application data files are stored in /data/data/<app-name>/, and are read-writable only ...
10
Here's a helpful piece of info also.
This is the absolute path to SMS and MMS DB on most android devices:
/data/data/com.android.providers/telephony/databases/mmssms.db
10
Looks like it moved to data/User_DE/0/com.android.providers.telephony/databases with Nougat.
At least, this is where it can be found on my Nexus 6. Hope this helps.
10
It might not always be possible to transfer data between multiple users/profiles. It depends on the Device/Work Policy Controller app, installed by you or your IT admin.
Android device can be managed in two ways: fully managed (which is setup at the time of first use or after factory reset on a company owned device) and work profiles (which can be added or ...
9
Note that, as of Kitkat (Android 4.4, released Sept 2013), the default path changed from:
/data/data/com.android.providers/telephony/databases/mmssms.db
to
/data/data/com.android.providers.telephony/databases/mmssms.db
Update: As mentioned in the comments, the latter path already exists in JB.
9
Even it does not fully answer the question, here's a guide to decrypt the external storage formatted as internal. You do need to be root on your phone, however.
The gist is that we search for strings including the keyword expand and ending with .key within vold using:
$ strings vold|grep -i expand
--change-name=0:android_expand
%s/expand_%s.key
/mnt/expand/...
8
I installed the Disk Info app and in the options, I enabled Expert mode and Unmounted partitions. It doesn't say "swap", but it shows clearly that it's the only other partition on the SD card and it's the right size, so /dev/block/mmcblk1p2 must be the one:
Swapper 2 is configured to use /dev/block/mmcblk0p3 by default, so I'm glad I didn't go with the ...
8
fdisk -l works if you pass the whole disk device name explicitly (e.g., fdisk -l /dev/block/mmcblk1); what does not work is automatic discovery of block devices (apparently because Android places block device files under the /dev/block directory, but fdisk expects to see those files directly in /dev). Therefore one option is to collect the list of whole disk ...
8
DiskInfo displays this information (among other things) when you select a partition to view its details. Works with the internal partitions on my Nexus 5, but should also support external SD cards and the like:
8
In the settings of Google Play Music, if you have it set to cache on the external SD card, your cache location will be /external_sd/Android/data/com.google.android.music/files/music/.
If you have it use the internal storage, the path will be /sdcard/Android/data/com.google.android.music/files/music.
Note that these files are named [some-id].mp3, like 124....
8
For accessing your Android device via USB in "File Transfer" mode your computer uses the MTP protocol. This protocol allows to list and read/write the files from/to your device.
What most people don't know is that the MTP protocol does not show the content of the file-system. Instead it uses the Android MediaStore Database (an SQLite database) ...
7
As su, do this :
# mount -o remount,rw /system
You will now be able to delete it.
As said in comments, don't forget to
# mount -o remount,ro /system
or just reboot when you have finished. :)
7
WARNING: I have not tested this procedure.
You would need to have fstrim in system/bin. This XDA post has a DropBox download link.
start up adb and then switch users to root.
$ adb shell from your os terminal.
$ su to switch to the root user.
To copy fstrim to your /system/bin path you first need to mount the system path as Read/Write from adb or some ...
7
I just tried and found that you need to modify a file:
sys/class/power_supply/usb/device/charge
its default content is '1' which means 'enable charging'
you need to set it to '0' to 'disable charging'
$ su
$ echo 0 > /sys/class/power_supply/usb/device/charge
I tested on Nexus 4 and it's working successfully.
7
1) On which physical storage does "Memory" sit
When the specs say "Memory", it's referring to the RAM that the device has. This is not persistent storage, it is "volatile" storage, which loses its information when unpowered (after a brief discharge time). RAM is memory the system and apps use to function, for things like storing the state of an application (...
7
Back in 2012, /proc/last_kmsg (1) used to be a dump of kernel console messages, exported after reboots by Android's ram_console functionality (CONFIG_ANDROID_RAM_CONSOLE), which used persistent_ram (CONFIG_ANDROID_PERSISTENT_RAM) to handle a block of RAM that wasn't erased across reboots (2).
persistent_ram was based on Linux upstream RAMOOPS code which ...
7
Android supports fstrim but it only works if the phone is idle for a long time while charging
It's not so. On newer versions, Android runs fstrim with a daily schedule, provided that the conditions meet. Or it should run on a reboot if not run for 3+ days. See this answer for details and how you can run fstrim manually.
FRAGMENTATION ON FLASH MEMORY:
I ...
6
Old thread but found something nobody else has mentioned... just in case anyone finds it useful.
ls -la /dev/block/bootdevice/by-name
The directory contains named symlinks to all the partitons.
6
I realize that this is an old topic, but some of the answers here actually hindered my efforts to learn about fstab and Android because they so strongly imply that the fstab situation in Android is extremely different from other Linux distributions. From what I can tell, it isn't.
However, reading different responses here made me wonder: what fstab-...
6
Even more useful information can be obtained from parted. An example when the block device is /dev/block/mmcblk0:
~ # parted /dev/block/mmcblk0 print
Model: MMC SEM04G (sd/mmc)
Disk /dev/block/mmcblk0: 3959MB
Sector size (logical/physical): 512B/512B
Partition Table: gpt
Number Start End Size File system Name Flags
10 524kB 1573kB ...
6
There's no direct equivalent in Android. Each app has its own directory in /data/data (for a multi-user system, it's /data/users/n). Apps are encouraged to show a metadata-based view of user data, instead of requiring the user to worry about individual files. Each app stores the files and databases that hold its documents, and its configuration files, in its ...
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