Owners of Xiaomi’s Redmi Note 9 series smartphones often face a situation where internal storage is overflowing, which leads to a slowdown in the system and the inability to install new applications. The MIUI operating system installed on the device accumulates a huge number of temporary files, remnants of deleted programs and messenger cache. If you notice that the phone has started to work more slowly or the system writes about a shortage of space, it’s time to do a general cleaning.
Effective memory cleaning requires a comprehensive approach, from using built-in tools to manually deleting files through the file manager. In this article, we will discuss all available optimization methods that will help return your Redmi Note 9 to its previous speed. It is important to understand that regular maintenance of the gadget prolongs its life and ensures the stability of all functions.
Before you start taking drastic measures like resetting, try a series of simple steps to free up space. Storage analysis will show which files occupy the most megabytes, which will allow you to act point-by-point. We will look at safe ways to delete data that will not lead to loss of important information, if you take care.
Analysis of vault occupancy
The first step in the fight for space should be diagnostics. The built-in MIUI provides a convenient tool to visualize what your Redmi Note 9 memory is doing. Go to the Settings → Memory menu, where the system will present a detailed file distribution diagram. Here you can see the volume occupied by applications, images, video, audio and system files.
Users are often surprised to find that much of the content is not personal photos, but messenger data or streaming cache. System analyzer helps to identify such “hidden” space absorbers. Note the “Other” category, which is often inflated by temporary update files and logs of the system.
- 📊 Use the built-in schedule to determine the largest categories of files.
- 🔍 Check the Downloads folder where forgotten installation files often accumulate APK.
- 📱 Estimate the size of installed games that can weigh a few gigabytes.
Understanding the structure of the occupied space is key to a successful cleanup, so you don't want to delete files at random, you'd better spend a few minutes studying the statistics, and you can avoid accidentally deleting important documents or system components.
Use of the built-in "Security" application
The easiest and safest way to clean up for beginners is to use the regular Security app, which is preinstalled on all Xiaomi smartphones. This tool automatically scans the device for junk files, cache and residual data. To start the procedure, you just need to open the application and press the large green Cleanup button.
After scanning, the system will suggest removing temporary files that do not affect the operation of applications. However, it is important to be careful: sometimes files that you planned to save fall into the list of candidates for deletion. Clearing the cache through this menu is safe for most programs, since it only deletes temporary data, but not your personal settings or game progress.
⚠️ Warning: Do not use third-party software from Play Market with aggressive advertising. built-in tool MIUI It is quite enough, and third-party software can, on the contrary, slow down the work of the Redmi Note 9.
Additionally, the Security app has a deep cleanup feature that analyzes large files and duplicates, a useful tool for finding forgotten videos or repetitive photos, and regular use of a standard cleaner will help keep the system on track without having to dive deep into the file structure.
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Start a built-in cleanup once a week to prevent critical memory filling with junk files.
Cleaning the cache and application data
The main consumers of free space on a modern smartphone are social networks and instant messengers. Apps like Telegram, WhatsApp, Viber and Instagram store all the photos and videos viewed in cache, which over time can reach tens of gigabytes. To manage this storage, you need to go to Settings → Applications → All applications and select the desired program.
In the menu of the selected application, you will see two important buttons: Clear cache and Clear all (or Clear data). The first option is secure and only deletes temporary files. The second option will completely reset the application to the “just installed” state, removing correspondence (if there is no backup) and logins. Be extremely careful when using a full cleanup.
| Action. | What's removed | Risk of data loss |
|---|---|---|
| Clearing the cache | Temporary files, thumbnails | No. |
| Clearing the data | Settings, accounts, correspondence | High-pitched |
| Deletion of the annex | All application files and cache | Tall (no backup) |
Telegram, which stores media files in its internal folder, ignores standard Android cleaning methods. Inside the application itself, in the Settings → Data and Memory → Memory Use section, you can configure cache autodeletion, for example, delete downloaded files if they have not been used for 3 days.
☑️ Checking messengers
Working with the DCIM Gallery and Folder
The most obvious way to free up space is to delete unnecessary photos and videos. The DCIM folder is the primary storage for all shots taken with the Redmi Note 9 camera. High-resolution videos can take up hundreds of megabytes each, so reviewing them gives an instant result. Use the built-in Gallery app to sort and delete.
MIUI has a handy Album feature that automatically aggregates screenshots, selfies, videos and WhatsApp images. Often, the Screenshots folder accumulates hundreds of superfluous interface images that can be easily deleted, and it’s also worth checking the Others folder inside the gallery, where files from remote applications may be hiding.
If you’re not ready to leave your photo archives forever, a great solution is to use cloud services: upload photos to Google Photos, Yandex.Disk or the Mi Cloud, and then use the Free Space feature, which will delete local copies, leaving them available online, which will keep your phone’s memory free for new pictures.
⚠️ Before mass deletion, be sure to check the recently deleted folder in the gallery. The files are stored there for 30 days and continue to take up space until they are finally deleted.
Removing Unused Applications and Games
As time goes on, the apps you've stopped using accumulate on your smartphone: Games, banking apps, food delivery services all take up space and can run in the background, consuming resources. To delete, go to Settings → Apps → All apps and sort the list by size or date of last use.
Removing heavy games can free up 2 to 10GB of space instantly. If you don't want to remove the app completely but you need urgent space, some games allow you to clear the cache of resources, although this will require re-uploading data the next time you run. MIUI also has a dual apps feature, and if you don't use it, cloned versions of programs also take up extra space.
- 🎮 Remove games that haven’t been played for more than a month.
- 🛒 Check for duplicate applications (main and lite versions).
- 📉 Disable or remove system applications from Google and Xiaomi that you do not use (via Google) ADB or setting).
How to remove system applications?
Also worth noting is the pre-installed software, often called “bloatware,” which, although it can’t be removed by standard means, prevents them from being updated and cache-accumulating, especially for services you don’t plan to use in the future.
Transfer data to memory card and cloud
Xiaomi Redmi Note 9 is equipped with a microSD card slot, which is a great solution to the problem of space shortage. You can transfer all photos, videos, music and documents to an external drive. To do this, insert the card, then in the file manager select the files and use the Move to function. → SD-map.
It is important to note that the transfer of the applications themselves to the memory card in modern versions of Android and MIUI It's often unavailable or unstable, but you can set the camera and voice recorder to save files directly to the memory card by default. → Save it on. SD-map.
Using a U1 or higher memory card is critical to keeping the camera running smoothly and recording video without delay on the Redmi Note 9.
Cloud storage is a modern alternative to physical cards: services like Google One provide 15GB for free, which is enough for thousands of documents and photos; setting up automatic sync will allow you to forget about manual file transfer; if your phone is lost or broken, your data will remain safe.
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The combination of a media memory card and a document cloud ensures maximum space efficiency on the Redmi Note 9.