it seems that I've got 1,5gb of data in internal (system data) - how can I delete?


The internal-storage partition is formatted when you execute a factory reset.

  • actually "system data" is in diskusage app – patrickdrd May 23 '18 at 14:19
  • To what partition does it refer? – Simon V. May 23 '18 at 14:19
  • /system is never wiped - as it is read-only there is no need to wipe it. – Robert May 23 '18 at 17:46
  • it's in internal – patrickdrd May 23 '18 at 17:51
  • Then a factory reset should delete the files. Or you can locate them and delete them manually. If you are referring to the 'internal storage' of your phone (simply everything), this contains the system as well. But you shouldn't delete the system for obvious reasons. – Simon V. May 23 '18 at 17:55

According to the AOSP sources of the disk usage settings app the category System is Everything else that hasn't already been attributed.

In concrete the value is calculated based on the "Others" value minus the data occupied by apps that belong to the the other displayed categories.

This makes it very difficult to say what data is included in this category.

Anyway 1.5GB of system data is typical value for an Android phone. It is not necessary to take any actions.

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