Where does memory go in the Xiaomi phone: a full analysis of the reasons

The situation where the internal memory of a smartphone suddenly runs out, familiar to many owners of Xiaomi and Redmi devices. You just downloaded an app update, took some photos, and suddenly the system reports a critical shortage of space. It is puzzling: yesterday, a few gigabytes were free. Where could they disappear in a couple of hours?

The problem of the “disappearing” gigabytes in MIUI and HyperOS often lies not in one particular cause, but in a combination of factors. The Android operating system is designed to make use of free space to caching data to speed up, but sometimes this mechanism gets out of control, and the system partition begins to grow disproportionately.

In this article, we will look at where hidden files are hidden, why a.thumbnails folder can weigh tens of gigabytes, and how messengers are stealthily absorbing your disk resource. Understanding the structure of the file system is the first step to freeing up space.

System cache and temporary files: invisible consumers

The main “eater” of free space is often the cache of applications and systems. When you use a browser, browse through social media feeds or watch videos, Xiaomi stores temporary data on the disk so that when you re-refer to content, it loads instantly, over time, this data can reach 10-20 GB.

Video viewing apps and streaming services are particularly aggressive in this regard, cacheing buffers, previews and portions of streaming video; if you don't clean the cache regularly, it accumulates dead weight, and unlike user data, you can delete that information without fear of losing accounts or correspondence.

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Use Xiaomi’s built-in Security app for quick cache cleanup, but it’s better to use a storage analyzer for deep cleaning.

It’s worth noting that after a major MIUI or HyperOS update, the system can back up old settings or temporary installation files, which are usually deleted automatically after a reboot, but sometimes get stuck in the system partition.

• 📱 Social media cache (Telegram, VK, Instagram takes up to 60% of the place in the "Apps" section».
• 🎞️ Video buffering in YouTube and online cinemas creates thousands of small files.
• 🔄 Cloud services sync errors can duplicate temporary files in hidden directories.

Thumbnails folder phenomenon and hidden directories

One of the most famous problems in the Android environment is the proliferation of the.thumbnails folder. This hidden system directory is designed to store thumbnails of photos and videos from your gallery. The logic is simple: to open the gallery quickly, the system creates reduced copies of all media files. However, on Xiaomi smartphones with ichon screens, these thumbnails can weigh a lot.

Compounding the problem, standard cleaning tools often ignore system folders that start with a dot. You can delete all the photos, but the thumbnails folder will stay and continue to take up space, waiting for new files. In some cases, its weight reaches absurd 30-40 GB, which is critical for budget models with 64 GB of memory.

⚠️ Warning: Do not delete the.thumbnails folder through the file manager without first creating a backup or using special scripts. The system can create it again, but the process of re-creating thumbnails for thousands of photos will temporarily boot the processor and heat the device.

In addition, many applications create their own hidden folders at the root of internal memory. For example, file uploaders or messengers can store data in directories that are not displayed in the standard storage review. To see them, you need to enable the display of hidden files in the MIUI Explorer settings.

Messengers: Telegram, WhatsApp and their databases

Telegram and WhatsApp are set to automatically save all received media files by default. If you are in dozens of channels and chats where videos and photos are posted daily, your phone becomes a warehouse of unnecessary content.

In Telegram, the situation is complicated by the peculiarity of caching: the application stores the media viewed in a local cache for quick access. Even if you cleared the chat visually, the files can remain in the phone’s memory until you forcibly clear the cache in the settings of the application itself. The message database also tends to grow, especially if there are many files sent in the chats.

To solve the problem, you need to go to the settings of each messenger, find the item "Data and memory" (or similar), and set up automatic cache cleaning. For example, on Telegram you can set the cache autodeletion after 3 days or a week, which will save correspondence, but will free up space from media files.

• 🗑️ Automatic cache cleaning in Telegram prevents overflow of memory with media files.
• 💾 WhatsApp creates backups locally that can be duplicated in Google Drive and take up space twice.
• 📹 Video files in chat rooms often weigh more than the originals due to recompression when forwarding.

Storage analytics: resource table

To understand what exactly takes up space, it is not enough just to look at the settings. Different file types affect performance and available space differently. Below is a table showing which partitions are most often "eating" memory on Xiaomi devices.

As you can see from the table, the greatest potential for freeing up space is working with messengers and system cache. However, you should be careful with system logs: manual removal without root rights is often impossible, and with superuser rights you can damage the bootloader.

⚠️ Note: Do not attempt to delete files from system partitions (e.g, /data or /system) manually, if you don't know exactly what they're going to do, it can cause a bootloop to happen.

Instructions for deep memory cleaning

To effectively free up space on Xiaomi, a comprehensive approach is needed. Just removing a couple of apps will not be enough. Follow the algorithm below to safely return gigabytes.

Start by analyzing large files. The built-in storage analyzer in MIUI often only shows categories. Use third-party utilities or connect your phone to your PC to find forgotten 4K videos or APK installation files left over after a software update.

Next, move your data. Photos and documents are better stored in the cloud (Google Photos, Yandex.Disk) or on your computer. Turn on the "Free Space" function in Google Photos, which will delete from the device copies of those images that have already been uploaded to the cloud.

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Regularly transferring media to external media or to the cloud is the only way to ensure that memory does not end suddenly.

If nothing helps, you can use Recovery to clean the Dalvik Cache partition cache, which is safe for user data, but requires you to log into Recovery mode (usually the volume button up + power when the phone is off).

Prevention and system setting

To keep the memory problem from coming back, it's important to set up the system correctly. HyperOS and newer versions of MIUI have built-in optimization mechanisms, but they need to be activated. First of all, limit the background activity of heavy applications.

Also, you should disable automatic updates of applications over the mobile network if you have a tariff with a limit, and allow updates only over Wi-Fi. This will prevent the accumulation of old versions of installers. Regularly (once a month) reboot your smartphone - this helps the system correctly complete background processes and clear temporary buffers.

• 🚀 Turn off auto-update apps in Google Play, leaving only Wi-Fi.
• 📉 Set a limit on the cache size in the browser settings (if such an option is available).
• 🔄 Regularly restart the device to reset system caching errors.

Frequently Asked Questions (FAQ)