When I walk through the system folders of my old android phone to clean it I could see that there was a mtklog folder containing an audio_dump folder, itself containing many files in the form VMLog_%Y_%m_%d.vm in the Internal Storage folder.

As the name of the folder suggests that I have to make audio files I tried to play them as PCM RAW file, without success. Despite several searches on the file format I did not find any information.

Someone knows what these files are, if it is possible to read them to know what they are or just if there is a risk to delete them because I would not like to make the system unstable by deleting them. Thanks for your help.

  • Deleting something from Internal Storage (/sdcard) won't make system unstable. Stock apps are habitual creating such type of junk. But if you are curious, you can try strings on those files to take an idea what they contain. Or you can watch the directory to track which and when an app/process writes those files. – Irfan Latif Mar 28 at 22:34
  • Thank you very much for your time and your clear answer. What's is 'Stock apps' please ? I have use strings program with different encoding on .vm file but the files are binary file without usefull strings informations. I have also try 'hexdump' and the only usefull informations is two bytes (probably more) repeated in the file and other bytes also repeated in the files. But with this 'MAGIC header value' I have no found any result on search motors. – mizizad Mar 29 at 5:56
  • Stock apps are those shipped with original ROM (OS) by OEM. Usually there are a lot of bloatware among them. If strings and hexdump don't work, you can watch the directory to find out the culprit process. – Irfan Latif Mar 29 at 6:47

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