How to find and free up internal memory in an Android phone

Smartphone owners are often faced with a situation where the device starts to work slower, and notifications about lack of space appear at the most inopportune moment. Internal memory is the main storage of your gadget, where the operating system, installed apps, photos and personal data are stored. Understanding exactly how storage is structured is the first step to optimizing the performance of your smartphone.

Many users confuse the concepts of random access memory (RAM) and built-in memory (ROM), which leads to incorrect actions when trying to free up space. If RAM is responsible for the performance of running applications here and now, then internal memory is your long-term warehouse. You can find its contents and understand the occupied space in several ways, from simple settings to using advanced analysis tools.

In this article we will examine in detail methods for finding hidden files, system garbage and user data. You will learn to distinguish important system files from temporary ones that can be safely deleted, and you will also understand why even after deleting photos, space may not be freed up immediately.

Standard storage settings in Android

The most obvious and safest way to find out what is taking up space on your device is the built-in settings menu. The interface may differ slightly depending on the manufacturer's shell (for example, MIUI, One UI or ColorOS), but the operating logic remains the same. The system automatically scans the drive and groups files into categories for user convenience.

To get to this section, you need to go to Settings → Storage (or Memory). Here you will see a color diagram that clearly shows the distribution of space. Typically, the data is divided into groups such as Applications, Images, Videos, Audio and System Data. Clicking on any of the categories allows you to drill down the list and see specific files.

Pay attention to the “Other” or “Miscellaneous” item. Often this is where gigabytes of forgotten downloads, residual files from deleted apps and messenger caches are hidden. Some manufacturers, such as Xiaomi or Samsungoffer built-in cleaning tools directly from this menu, which can safely delete temporary files without risk to the system.

⚠️ Attention: Do not delete files from the “System Data” or “Android” section manually through the file manager if you are not sure of their purpose. This may lead to incorrect operation of applications or loss of settings.

Using the built-in file manager

If the standard settings menu seems too general to you, the file manager will come to the rescue. Almost every modern smartphone comes pre-installed with the “Files” or “File Manager” application. This tool allows you to look deeper into the directory structure than automatic analyzers do.

Once you open the manager, you will see two main sections: “Internal storage” and, if available, “SD card”. We are interested in the internal section. Within it, files are often sorted by type: documents, APK installation files, archives, and downloads. This is a great way to find forgotten app installers that can take up hundreds of megabytes.

Particular attention should be paid to folders with the names of popular applications. For example, the folder Download is often filled with PDF documents and pictures from the browser, and the folder DCIM contains your photos. However, the heaviest data is often located in the folder Android, inside subdirectories data and obb. The game cache and Google service data are stored here.

• 📂 Folder DCIM —the main storage location for photos and videos from the camera.
• 📂 Folder Download —all files from the Internet are saved here.
• 📂 Folder Bluetooth —files received via Bluetooth connection.
• 📂 Folder Android/obb —cache files of heavy games and applications.

Using third-party explorers such as Solid Explorer or CX File Explorer, can give a more clear picture. They often have a "Storage Analysis" feature that builds an interactive memory map, showing the largest files as circles or blocks. This allows you to instantly find and remove “heavyweights” that you may have spent hours searching for.

Analyzing used space through a computer

Sometimes the smartphone screen is too small to conveniently analyze the file structure. Connecting the device to a computer via a USB cable opens up new possibilities for searching and sorting data. In this mode, the phone is detected as an external drive, and you can use powerful PC tools for analysis.

To begin, connect your smartphone to the computer with a cable and select the file transfer mode (MTP) in the notification on the phone screen. After this, a disk with the name of your device will appear in “My Computer”. Standard Windows Explorer allows you to sort files by size, which is convenient for searching large videos or archives.

However, it is much more effective to use specialized software for analyzing disk space, for example WinDirStat, TreeSize Free or WizTree. These apps scan the connected phone and visualize the used memory in the form of a color map (treemap).

app	Scanning speed	Visualization	Usability for Android
WinDirStat	Average	Color card + folder tree	High
WizTree	Very high	Color card	High
TreeSize Free	High	Tree structure	Medium
Windows Explorer	Low	File list	Low

This approach allows instantly identify anomalies: for example, a folder with logs that has grown to several gigabytes, or a forgotten system image. Remember that when deleting files via a computer, the changes are applied instantly, without the ability to be restored through the phone's Trash.

Why may the computer not see some folders?

Modern versions of Android (starting from 11) limit access to system folders on the internal drive when connected via USB. You may not see the contents of the Android/data folder, since access to it is closed for security reasons.

Hidden folders and system junk

A significant part of the memory is often occupied by files that are hidden from the eyes of the average user. On Android, folders or files whose names begin with a dot (for example, .thumbnails) are considered hidden. By default, file managers do not display them, but they take up space properly.

To find such objects, you need to enable the “Show hidden files” option in the settings of your file manager. After this, you will be able to discover many service directories. One of the most famous “eaters” of space is the folder .thumbnails inside DCIM. It stores thumbnails of your photos for the gallery, and over time this cache can reach tens of gigabytes.

It is also worth checking the folders of streaming services, such as Spotify or Netflix. If you listened to music or watched movies offline and then deleted the application, the files may remain on the disk. They are often located in hidden directories inside Android/data or in the root of the internal memory.

⚠️ Attention: Deleting a folder .thumbnails is safe, but the gallery will have to re-generate the thumbnails the next time you launch it, which can temporarily load the processor and battery.

Another source of hidden garbage is residual files after deleting games. Often, developers leave cache folders with the game name even after the application itself is deleted. Regularly checking the root of the internal storage for folders with the names of deleted apps will help maintain order.

Application cache and messenger data

The largest amount of user data in modern smartphones is occupied by instant messengers and social networks. Applications like Telegram, WhatsApp i Viber automatically save every received photo and video to internal memory. Without regular cleaning, they can quietly take up all the available space.

Unlike the system cache, which can be cleared with one button in the settings, messenger data requires a more delicate approach. Go to the settings of a specific application, find the “Data and Memory” or “Storage” section. There you will see a detailed breakdown: how much space photos, videos, voice messages and files take up.

You can set up automatic cache clearing. For example, Telegram there is a function that deletes downloaded media files if they have not been opened for more than a week. This does not delete correspondence, but frees up gigabytes of disk space, since files can always be re-downloaded from the cloud.

Also, do not forget about the cache of the browser and applications for watching videos (YouTube, TikTok). Watching short videos generates a huge amount of temporary files. Clearing the cache of these applications through system settings (Settings → Applications → [Select application] → Storage → Clear cache) is a safe and effective procedure.

Advanced methods: ADB and permissions superuser

For advanced users for whom standard methods are not enough, there are command line tools. The utility ADB (Android Debug Bridge) allows you to connect your phone to a PC in debugging mode and manage the file system at a deep level. This gives access to those partitions that are closed even to file managers with root access.

Using the command adb shell df -h, you can get accurate information about memory partitions and their occupancy in real time. And the command adb shell du -h /sdcard | sort -hr | head -n 20 will display a list of the 20 largest files and folders in the internal storage, sorted by size.

adb shell du -h /sdcard | sort -hr | head -n 20

This method is ideal for finding “ghost” files that are not displayed in the interface, but are taking up space. However, working with ADB requires caution: accidentally deleting a system file through the console can turn the phone into a “brick.”

⚠️ Attention: Settings interfaces and folder locations may vary depending on the Android version and phone model. If you do not find the described menu item, use the settings search or refer to the official documentation of the manufacturer of your device.

Frequently asked questions (FAQ)

Why is the space not freed up after deleting files?

Frequently deleted files first end up in the “Trash” inside the gallery or file manager. They continue to take up space until you empty the trash completely. It is also possible that the file was deleted from the SD card and you checked the internal memory, or vice versa.

Is it possible to transfer the internal memory to an SD card?

In modern versions of Android (starting from 6.0), there is an Adoptable Storage function that allows you to format the memory card as part of the internal storage. However, many manufacturers (Samsung, Xiaomi) have disabled this function in their shells. You can only transfer individual applications or media files manually.

What is the “System Data” section and can it be deleted?

This is a service section containing operating system files, temporary logs, update cache and system service data. It cannot be completely removed, but its size can be reduced by doing a factory reset or clearing the system application cache.

How to find the largest files on your phone without a computer?

Use the application Files by Google or the built-in analyzer in the storage settings. The application Files has a “Cleaning” tab, which often offers a “Large Files” section, showing objects weighing more than 500 MB.

Is it safe to delete the Android folder?

No, deleting the entire folder Android is absolutely not allowed. This will lead to the loss of data of all applications, reset of settings and possible inoperability of apps. You can only delete specific subfolders inside Android/datathat relate to already deleted games or applications.