Read Only File System on Android

Read only file system on Android

Got this off an Android forum where I asked the same question. Hope this helps somebody else.

On a terminal emulator on the phone:

mount -o rw,remount -t yaffs2 /dev/block/mtdblock3 /system

Then on the cmd prompt, do the adb push

read-only file system error when writing to SD card

i solved it...refer this link: http://daraizetechnologies.blogspot.in/2011/06/how-to-mount-sdcard-in-android-emulator.html it contains step by step guide to it..i had to create new sd card image and than in run configuration i gave path to that sd card and now i am able to put files on sd card..that link was useful

Cannot push to android emulator because of Read only file system

Try this:

$emulator -avd Nexus_5X_API_26_x86 -writable-system 
$adb root
$adb remount
$adb push hosts /system/etc/hosts

Android file writing Read-Only file system warning

You can write files only to Internal Storage (device memory) or External Storage (the SD card), see http://developer.android.com/guide/topics/data/data-storage.html. Simply opening a FileOutputStream with an arbitrary file name won't work since that file system is read-only.

Trying to create a file in Android: open failed: EROFS (Read-only file system)

I have tried this with and without the WRITE_INTERNAL_STORAGE permission.

There is no WRITE_INTERNAL_STORAGE permission in Android.

How do I create this file for writing?

You don't, except perhaps on a rooted device, if your app is running with superuser privileges. You are trying to write to the root of internal storage, which apps do not have access to.

Please use the version of the FileOutputStream constructor that takes a File object. Create that File object based off of some location that you can write to, such as:

• getFilesDir() (called on your Activity or other Context)
• getExternalFilesDir() (called on your Activity or other Context)

The latter will require WRITE_EXTERNAL_STORAGE as a permission.

Is there an easier way than writing it to a file then reading from it again?

You can temporarily put it in a static data member.

because many people don't have SD card slots

"SD card slots" are irrelevant, by and large. 99% of Android device users will have external storage -- the exception will be 4+ year old devices where the user removed their SD card. Devices manufactured since mid-2010 have external storage as part of on-board flash, not as removable media.

Android Studio - Read-Only Filesystem?

It is important to separate the directory and the file itself.

In your code, you call mkdirs on the file you want to write, which is incorrect usage because mkdirs makes your file into a directory. You should call mkdirs for the directory only, so it will be created if it does not exist, and the file will be created automatically when you create a new FileOutputStream object for this file.

Try this one:

File directory = getFilesDir(); //or getExternalFilesDir(null); for external storage
File file = new File(directory, fileName);

FileOutputStream fos = null;
try {
    fos = new FileOutputStream(file);
    fos.write(IDNum.getBytes());
    fos.close();
} catch (IOException e) {
    e.printStackTrace();
}

android terminal rm read-only file system

If you are using an sd-card try mounting the file system as rw

sudo mount -rw /dev/DEVICE NAME 

If that gives and error add a -r in there also and you could just try using

sudo mount -r /dev/DEVICE NAME

or

sudo chmod +x on the folder or file.

Android - rooted user - mount: Read-only file system

The following works for me

mount -o rw,remount rootfs /

or to remount /system

mount -o rw,remount /dev/block/bootdevice/by-name/system /system

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