What happens to the memory of Xiaomi Redmi 9: the complete guide

Owners of Xiaomi Redmi 9 often face a situation where the available storage is rapidly decreasing, although the user did not download new heavy apps or movies. This is a common problem for budget devices with internal storage of 32 or 64 GB, where the MIUI operating system occupies a significant part of the disk space even before the start of active operation.

Understanding how the system manages files and where gigabytes of data are hidden will allow you to manage the device effectively. Unlike more expensive models, there is no hundreds of gigabytes of storage, so every megabyte counts.

In this article, we will analyze in detail the mechanisms of filling the storage, study the hidden system processes and consider proven methods of safe cleaning that will return your gadget to its previous speed.

System Files and Features of MIUI Shell

One of the main reasons for the lack of space is the operating system itself. The MIUI shell installed on top of Android contains a lot of preinstalled services, fonts, themes and background images that take up a significant amount of space. After installing all security updates and system patches, the System partition can grow to 15-20 GB, which for a budget Redmi 9 is almost a third of all available space.

In addition, the system creates backups and error logs that are not always deleted automatically. Log files can accumulate for months, especially if the smartphone periodically crashes. The user rarely sees this data in the standard menu, since it is hidden from view to avoid accidental removal of critical components.

It is important to note that when you update your firmware over the air (OTA), old system files are not always deleted immediately; they can be stored in a hidden partition in case the version rolls back, taking up space that could be used for your photos and applications.

⚠️ Warning: Never attempt to manually delete files from system folders through root-righted file managers without knowing exactly what they are intended).

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Use the built-in Security app for initial memory evaluation, as it correctly displays system partitions, unlike third-party analyzers.

Bloating the cache of applications and messengers

Social media and instant messengers are the most active consumers of free space. Apps like Telegram, WhatsApp and Viber, by default, store all received media files in internal memory. Over time, self-save folders can grow to several gigabytes, even if you have cleaned the chats visually long ago.

Cache is temporary data that speeds up the loading of frequently visited pages and viewing previously opened images. However, in Android, the cache clearing mechanism does not always work effectively. Many applications just keep writing new data without deleting old ones, which leads to so-called “bloated” cache.

Especially, if you're a web user, your browser cache can take hundreds of megabytes. This is normal for speed, but critical for Redmi 9, which is limited in size. Regularly cleaning these sites helps to free up space, although it will require re-authorization on some resources.

• 📱 Telegram: Stores all photos and videos viewed in the cache folder, unless autodelete is enabled.
• 📸 Instagram: Creates a huge cache of viewed stories and tapes that doesn’t clear itself.
• 🌐 Chrome: Stores copies of all visited pages for offline access.
• 🎵 Spotify/Yandex Music: cache tracks heard, even if they are not uploaded to the playlist.

Hidden folders and duplicate files

Often users forget files that were previously uploaded or saved automatically. There are many folders in the Xiaomi file system where applications drop data without the owner’s knowledge. For example, the MIUI/Gallery/cloud/cache folder can store thumbnails of cloud photos that have already been deleted from the gallery but have physically remained on the disk.

Another problem is duplicates: When messengers fail to load or re-sync, the same files can be stored in different directories. The storage analyzer in the phone settings does not always see such duplicates, because it considers them unique objects in different folders.

Also worth paying attention to is the Download folder, which is where browsers and instant messengers often store APK installation files, documents and pictures, and users rarely look, which can accumulate several gigabytes of digital junk in a year.

Garbage after updates and installation of applications

The process of updating apps in Google Play or Mi GetApps leaves behind installation files, although the system tries to delete the files. APK-files after installation, app store failures or download interruption can cause the installer to remain dead weight.

Also, when you update the MIUI system itself, you back up the current version, which in theory should be deleted a few days after a successful update, but in practice, this trigger sometimes doesn't work. Updates can weigh between 2 and 4 GB, which is a significant loss for Redmi 9.

Some apps don't erase their configuration files completely when they're deleted. Residual data can be stored in an Android/obb folder or in the developer brand name root directories, especially for heavy games that leave a cache of resources when they're deleted.

⚠️ Attention: Folder Android/obb It contains game data. If you delete the contents of the game completely, the games will stop running and require re-loading resources.

Cleaning Tools and Storage Optimization

To combat space shortage, Xiaomi has a powerful Cleanup tool built in. It's in the Security app. However, the standard scanner is often superficial. For deep cleaning, it's recommended to use a built-in storage analyzer that visually shows which categories occupy the most space.

There is also the option of using ADB (Android Debug Bridge) to remove system debris, but this requires a connection to a computer.A safer method for the average user is manually checking folders through a size-sorted file manager.

An effective way is to cache applications that you rarely use but that continue to work in the background, and it also helps to disable autoload media in instant messengers, which will prevent future overflows.

Remember the "Basket" in the gallery, because the deleted photos and videos don't disappear immediately, but they go to the "Deleted" album, which is stored for 30 days, and releasing this folder can instantly return you a few gigabytes.

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Regular cleaning of the Remote folder in the gallery and messenger cache frees up to 40% of the occupied space on Redmi 9.

Use of cloud services and external drives

Because it is impossible to increase the physical memory of a smartphone, the logical solution is to move data to the external environment. Xiaomi offers a cloud service Mi Cloud, which is integrated into the system, which allows you to store photos, contacts and notes on servers, freeing up local space.

Alternatively, Google Photos or Yandex Drive services. Auto synchronization setting with the "free up space" function allows you to store the original photos in the cloud, and only leave compressed copies or links on your phone.

An important feature of Redmi 9 is the availability of a separate slot for a microSD card. This is rare for modern smartphones. By transferring all photos, videos and music to the card, you can significantly relieve internal memory, leaving it only for the system and applications.

• ☁️ Mi Cloud: 5GB free, deep integration with the system.
• 📸 Google Photos: easy media management, smart search, but quality compression in a free tariff.
• 💾 SD-Map: Cheapest way to expand, but read faster than internal memory.
• 💻 USB-flash drive: use OTG-cable for periodic resetting of data archives.

⚠️ Note: When installing applications on SD-map (if the function is supported by a specific version) MIUI) Their speed may decrease, and when the map is removed, they will cease to start.

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