The user enters the Settings, see what his place is occupied.
He sees there "categories": Applications (well, ok, I have them installed, I don’t mind), Images / Video / Audio (well, okay, I kind of have it), System (eh ... a lot of course, but apparently without this, no matter how), Cache (well, I heard something about it ... the benefit is not very much, probably it's normal ...), Other (STOP !!! I didn’t order the "other" ... Oh ... And here gigabytes ... Ah, here it is where my place was "stolen", but I heard somewhere sometime that all Google programmers are fools last, obviously dumber than "my neighbor kultshaker" (and, by the way, remembered that he said authoritatively that "they are fools") that the Android OS constantly “eats” the memory “incorrectly” (oh, I don’t remember what kind of memory it was there, but about this “everyone says”) ...
Well, everything "found where the dog is buried," shchaz in a quick "Other folder" I will find, delete everything that I "did not order" and I will be happy ...

All this is very naive.

The “tool” for “analyzing” the occupied space that “sits” in the Android OS in Settings, starting from the very beginning of the Android OS until now, is a “tool” at the level of Murzilka magazine as the Great British Encyclopedia.
In fact, it is simple "to the point of madness":
OS looks at all occupied place, checks what files.
All that can be defined as categories: "Programs, audio / saw / pictures, system, cache" calls these words.
And everything (!) The rest calls "Other."
Calls indiscriminately, calls on the residual principle, so long as the amount is amusingly formed, so that errors in the school formula of arithmetic are not "just the minus is equally free".

And when the mounting of two logical partitions of memory is added to this, one available to the user, the other hidden from it, one dedicated "for two" partition of physical memory, with the "inability of the OS to divide how much each of them took place here", then ... magazine "Murzilka" will be closer to the "Funny Pictures".

With this approach, in the "Other" except garbage fall gigabytes of useful files.

Post has been editedW.Master - 10.02.19, 16:33

Yura L.,
Do not expect that "Other" in your case will be significantly less than a gigabyte.
You see that:

1. data folder is mounted along with user internal memory.
   
2. data folder more than 3GB.
   
3. how many programs there are, how many of these programs, how many other data, plus user files, which the OS for one reason or another does not assign to other categories of files.

You do not want to understand simple things:

• “Other” does not mean “useless”
  
• trying to reduce it "close to zero" is useless:
  1. it is necessary not to deal with the "other", but with the garbage that remains from the user's actions or remote programs.
     
  2. there is no point in trying to understand what the OS calls "Other", much more useful is the time spent studying how the OS uses memory, where it stores what files, how it mounts.

Yura L.,
You, before watching the system folders, turn on the "root explorer" mode in ES Explorer.
Then provide ES root-rights to the explorer.

Otherwise, you will see only empty folders in the system partitions.

You need to look at the folder / data /, and you look at the folder / storage / emulated / 0 / Android / data /

Feel the difference?

But there are no unnecessary unnecessary files, if you are cleaning the system with SD-maid with root-rights.

Post has been editedW.Master - 09.02.19, 22:39

I would conclude that you have simultaneously mounted the data and / storage / emulated / section in this section.
By itself, this situation is not uncommon. But for the first time, I see the OS displaying the df command for this section in half less than the OS through Settings.

Since there is a root right, you can see what you have in / data / "going".

First you need to understand, and if you have a problem.

If you read about a cucumber, then you saw a mention of how to see what memory you have and how it is mounted by the teams via the Android terminal.
If you read carefully, you should have understood that under the "other" there may be the entire data section shown.

And if you have root-rights, you will not do anything better than cleaning up garbage in SD maid (with the provision of root-rights).

But if not with the “Other” folder to fight, but for the release of memory, then it is possible to learn how to integrate system program updates into the system partition.

Pro cucumber read?

This is the "eternal" question about the "Other folder".

And each time to write it is necessary to understand this question from one about the same:

1. you must immediately understand that this is not a “folder”.
   / if it was a folder, then everything was much simpler: opened the Explorer, found the folder there, and see what is there if not necessary = delete.
   
2. you need to figure out what exactly the "Other" specific firmware specifically calls for on your model of the device.
   Which files and from which sections this “under-tool” built into the OS for “analyzing” the occupied space includes the term “Other”.

Only after that it will be possible to draw conclusions about whether this “Other” is useless for the OS or just the opposite.

If you wish, you can read this =The topic "Questions for beginners": the search result for the word "cucumber".

P.S. If you do not really want to understand, but you need quick advice, as you have previously been advised. And without root-rights, all the more, only the council to clean SD MAID'om.

Post has been editedW.Master - 09.02.19, 00:12