Unless you also have access to the source code you will never truly know what partitions are safe to complete this task on and what data is really being stored in those partitions.
PHONEVIEW RECOVER DELETED ANDROID
And there are normally several partitions on an android phone. To be 100% sure you would have to complete this task multiple times per partition. Note 3: If you do this very often, the repeated writes on your internal storage will eventually cause it to die an early death. (this is not necessary, filling up /sdcard will overwrite empty space in /data because /sdcard resides on the /data partition. To work around this, you'll have to root your phone and run the command (as root) on a file in /data rather than /sdcard. If someone images the /data partition and runs recovery software on it, they'll be able to uncover recently deleted apps and app data. Note 2 : This will wipe the free space only in the user accessible part of your internal storage. If it isn't, you'll have to change that part of the command accordingly. Note 1: This assumes your internal storage is mounted to /sdcard. dev/urandom is a special file on Linux that, you guessed it, generates a stream of random numbers.
Zeros always look suspicious because it means you've probably overwritten something, so I'd recommend dd if=/dev/urandom of=/sdcard/random.data. Just delete the latter file once you're done. This simply copies the zeroes from /dev/zero to a file in your internal storage called zero.data. sdcard/zero.data: a file on your internal storage called "zero.data" (can be called anything)
dev/zero: a special file on Linux that generates a stream of zeroes Open a terminal and run dd if=/dev/zero of=/sdcard/zero.data till the internal storage fills up. If you just want to zero out empty space on the internal storage, it's pretty trivial actually.
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