The situation when a smartphone suddenly reports a lack of space, and upon detailed analysis of the content it turns out that the photos, videos and applications visible to the user occupy only a small part of the volume, causes confusion and irritation. This is a common problem in the ecosystem Androidthat often baffles even experienced users. The system begins to work slower, new applications are not installed, and updates are blocked.
The phenomenon of “disappearing” memory is not associated with a drive failure, but with the peculiarities of the file system architecture and operating system algorithms. Hidden datatemporary files, error logs and a bloated cache can quietly take up gigabytes of space. Understanding how exactly Android manages memory will help return the device to functionality.
In this material we will analyze the main causes of storage overflow and provide specific cleaning instructions. You will find out why the standard disk analyzer does not see some files and what tools are really effective for diagnostics. The main cause of the problem lies in the system “Other” folder and the messenger cache, which are not displayed in the standard list of applications.
The phenomenon of the “Other” folder: where gigabytes are hidden
The most common culprit for the mysterious disappearance of free space is the category that a standard storage analyzer labels as “Other” or “System”. This section contains files that the operating system cannot clearly classify as media, documents, or application installation packages. This includes remnants of uninstalled apps, temporary update files, and data left behind after a factory reset.
Many users are unaware that the folder Android/data often grows to incredible sizes. Applications, especially social networks and streaming services, store huge amounts of buffered content there for quick loading. Standard cleaning tools often bypass this directory, considering it systemic and important for the operation of apps, although in reality several gigabytes of “dead” cache can be stored there.
Use a file manager with access rights to system folders (for example, Total Commander or Solid Explorer) to safely explore the contents of the Android/data directory and find the heaviest folders.
Also in category “Other” often includes memory dump files (crash logs), which are created when the system crashes. If your device is unstable, these text error reports can fill up memory at an alarming rate. Removing them is safe, since they are only needed by developers for debugging, and not for everyday use of the smartphone.
Cache of applications and messengers: a hidden space eater
Messengers, such as Telegram, WhatsApp and Viber, are one of the main consumers of internal memory. They save every photo, video, and voice message you view in local storage. Even if you deleted correspondence in the application itself, copies of it may remain in the file system, continuing to take up precious megabytes.
Features cache is that it is created automatically and is rarely deleted by itself. Browsers, news feeds, and video services store image previews and video clips to make them reload faster. Over time, the size of this temporary storage can reach 5–10 GB, which is critical for devices with a memory capacity of 32 or 64 GB.
To clear it, you need to go into the settings of each application separately. The standard "Clear cache" button in the application menu is often safer than completely clearing data, since it does not require re-authorization. However, in some cases, for example, when working with Telegram, it is more effective to use the built-in “Memory Usage” function in the settings of the messenger itself, where you can delete the cache only for a certain period.
⚠️ Attention: Before clearing application data (not to be confused with the cache), make sure that you remember the password for your account, as this action will completely delete the local history of correspondence and settings apps.
Settings interfaces may differ depending on the version Android and the manufacturer's shell (MIUI, OneUI, ColorOS). The location of menu items may change, so if you do not find the path described, check the official help for your device model.
System logs, dumps and update remains
The operating system Android constantly records events, which is necessary for stable operation, but sometimes this process gets out of control. Log files (event logs) can grow in size if the system has a software glitch that repeats itself cyclically. Such files usually have an extension .log or .txt and are located in the root directories or folder /data/log.
Another hidden source of garbage is the remains of system updates. After successful installation of the new version Android or security patch installation files are sometimes not removed automatically. They can occupy from 500 MB to 2 GB. It is also worth checking the folder Downloadwhere many applications save APK installers by default, thinking that the user will want to install them again.
To find such files, standard tools are not enough. It is recommended to use specialized disk analysis utilities that visualize the folder structure. This allows you to see “heavy” files that are hidden from the average user. Below is a table of types of system garbage and their safe removal.
| File type | Location | Can it be deleted | Risk |
|---|---|---|---|
| Application cache | Settings → Applications | Yes | Low (the app will download the data again) |
| Error logs (.log) | System root /data/log | Yes | Low (only needed by developers) |
| Files.thumbnails | DCIM/.thumbnails | Yes | Medium (the gallery will take longer to open) |
| Remaining updates | Folder Download / System | Yes | Low |
Hidden folders and files with a dot in the name
In the file system Linuxon which based Android, files and folders whose names begin with a dot (for example, .nomedia or .cache) are hidden. They do not appear in the standard gallery or simple file manager. This is where the remains of deleted games, settings of deleted applications and temporary files are often hidden.
Particular attention should be paid to the folder .thumbnails inside the directory DCIM. It stores thumbnails of your photos and videos for quick display in your gallery. If you have a lot of media files, this folder can be several gigabytes in size. Deleting files from this folder is safe, but the next time you open the gallery, the system will spend time creating the preview again.
How to see hidden files?
To see files with a dot in the name, open any file manager (for example, “My Files” or “Files by Google”), click on the menu (three dots or stripes) and select “Show hidden files."
Also check the folder Bluetooth i Wi-Fi Direct. Files received wirelessly years ago could remain there and be safely forgotten. Users are often surprised to find old videos or archives there that they no longer remember.
Duplicates and “recycle bin” in the gallery
Modern smartphones are equipped with the “Recycle Bin” function in the gallery and cloud services. When you delete photos or videos, they do not disappear instantly, but are moved to a special section where they are usually stored for 30 days. For the system, these files continue to take up space, although visually they are no longer in the main feed.
In addition, duplicates are a common problem. If synchronization fails or manual copying occurs, the same files may be saved in different folders. For example, a photo from Instagram can be saved in both the camera folder and the application folder. Finding and deleting duplicates is an effective way to free up space without losing important information.
It is recommended to regularly check the Recently Deleted section in the gallery and clear it. It is also worth checking your cloud storage settings (Google Photos, Yandex.Disk). If the “Free up space” function is enabled, make sure that it worked correctly and deleted copies of files already uploaded to the cloud from the device.
☑️ Quick cleaning checklist
Using ADB for deep cleaning
For advanced users who were not helped by standard methods, there is a tool ADB (Android Debug Bridge). This is a console utility that allows you to control the device from your computer. With its help, you can remove system junk that is inaccessible even through file managers with root access.
Before use, you must enable “Developer Mode” and “USB Debugging” in your phone settings. By connecting your smartphone to your PC, you can execute commands to clean specific directories. However, this method requires caution: deleting a system file may cause the device to become unstable.
adb shell pm trim-caches 999999999This command forces the cache of all installed applications to be trimmed to the specified limit (in bytes). By specifying a large number, you are effectively clearing the entire available cache. This is a safe command built into modern versions Androidthat does not require root access.
⚠️ Attention: Using ADB commands to delete system files (
rm -rf) without a precise understanding of their purpose can turn the phone into a “brick”. Use only proven commands to clear the cache.
The safest and most effective way to deal with memory overflow is to regularly manually clear the cache of heavy applications and check the "Downloads" folder, rather than installing questionable cleaner apps.
Frequently asked questions (FAQ)
Why does the memory fill up by itself immediately after cleaning?
This happens due to background running of applications. Social networks and instant messengers instantly begin re-caching images and videos as soon as you open your feed. The system can also create new error logs if there is a bug in the software.
Is it safe to delete the Android/obb folder?
No, in the folder Android/obb Additional data for games and heavy applications (maps, textures, resources) is stored. If you delete this folder, games will stop launching and will be forced to download data again, which will again take up space.
How to find out which application hides the most data?
Go to Settings → Applications, sort the list by size. Often applications that take up little space in the "installed" list have a huge amount of data in the "Memory" section inside their settings.
Will a factory reset help?
Yes, a full reset (Wipe data/factory reset) is guaranteed to remove all junk, hidden files and file system errors. However, before doing this, be sure to make a backup copy of important contacts and photos, as all data will be destroyed.