Smartphone Xiaomi Redmi Note 9 Pro was originally positioned as a device with an excellent ratio of price to memory, but time and accumulated content take their toll. The owner of a modern gadget inevitably faces a situation when the system begins to warn about the lack of free space, which leads to a slowdown in the interface and the inability to install updates. In the operating system MIUI mechanisms for accumulating temporary files work aggressively, requiring periodic user intervention to maintain high performance.
In this article, we will explore not only standard cleaning methods, but also hidden features of the file system, which many people are not aware of. NAND-We will look at safe ways to remove garbage so that you do not lose important data in the pursuit of free gigabytes.
Before you start taking drastic measures, you need to audit what exactly occupies space. Often it turns out that half of the volume is occupied by video in messengers or cache streaming services that can be deleted painlessly. Understanding the structure of files is the first step to effectively optimize your Redmi.
Analysis of storage occupancy through standard means
The first step should always be diagnostics. The built-in MIUI shell security tool provides a fairly accurate picture, but often hides details. For advanced information, go to Settings → About Phone → Storage. Here, the system visualizes the distribution of data into categories: applications, images, video, audio and system files.
Note the “Other” item, which is often inflated to tens of gigabytes, hiding the remnants of deleted programs, error logs, and temporary update files. If you see the volume of “Other” disproportionately large, it is a signal for a deeper clean through a file manager or PC. A standard analyzer may not show the folder sizes inside specific applications such as Telegram or TikTok.
It's important to distinguish between "busy" and "used." Occupied space includes a system partition that can't be touched. The actual space available to the user on the 64GB version is often around 50-52GB because of the system's reserved ones. Don't be afraid if after buying a new phone, less is free than what's stated on the box - this is a technical feature of the disk markup.
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Use Full Screen in the gallery when analyzing photos to quickly find and delete serial shots or screenshots that are often duplicated on different albums.
Regular monitoring allows you to identify “gluttonous” applications before they completely burn memory. Some programs, especially navigators and maps, can cache huge amounts of data for offline work, which then lie dead for years.
Cleaning cache and temporary application files
The most effective way to free up space without deleting data is to work with cache. Cache is a temporary file that speeds up the launch of applications, but over time can take gigabytes. Unlike these applications, cleaning the cache will not lead to loss of logins, correspondence or progress in games. It is a safe operation that can be done regularly.
For manual cleaning, follow the Settings → Apps → All apps. Select a heavy app (like YouTube or Instagram) and click Clear → Clear Cache. Don't confuse it with the Clean All button, which will delete authorization data. MIUI also has a built-in Cleanup utility that automatically finds garbage, but manual control gives you a better result.
☑️ Checking the messenger cache
Telegram, for example, stores all the photos and videos viewed in cache, taking up space on the disk, even if they are already in the cloud. Inside the Telegram application itself, there is a powerful cleaning tool: Settings → Data and memory → Memory Use → Clear cache. There you can also configure the autodeletion of the cache, for example, in 3 days or a week.
⚠️ Warning: Do not use third-party Play Market cleaners with questionable ratings, which are often the source of advertising and can delete necessary system files, disrupting the work MIUI.
Another source of garbage is browsers. Chrome, Yandex.Browser and others store copies of the pages visited, and you can clean them through the browser settings in the "History" or "Privacy" section. Regular cleaning of the browser cache also increases privacy by removing traces of your surfing.
Work with the gallery: duplicates, screenshots and the cloud
Media files are the main enemy of free memory. The gallery on the Redmi Note 9 Pro can find similar pictures and screenshots, but often this is not enough. The built-in algorithm can skip duplicates made at short intervals. For deep cleaning, it is recommended to use a file manager and sorting by size.
Open Explorer, select Size by Size, and look at the top of the heaviest files. Often, there are forgotten 4K videos or long screen recordings. Deleting even three or four of those videos can free up more space than cleaning the cache of a dozen lightweight apps.
Use Hidden Albums or move archived photos to your computer. It's also worth checking the DCIM →.thumbnails folder. It's a hidden folder that stores gallery thumbnails. It can grow to several gigabytes. Periodic deletion of the contents of this folder is safe — the system will recreate thumbnails the next time you open the gallery, but it will speed up the work and make room right now.
Don't forget cloud services. Google Photos and Xiaomi Cloud let you store originals online, leaving only compressed copies on your device or deleting them after synchronization. Google Photos' "Free Space" feature does this automatically and securely.
Memory card use and data transfer
One of the main advantages of the Redmi Note 9 Pro is the availability of a separate slot for a microSD card. This is a salvation for those who do not want to constantly delete content. However, just inserting a card is not enough, you need to set up the system correctly to work with it. Modern versions of Android and MIUI allow you to use the card as an extension of internal storage, but it is better to use it as a portable media medium.
To transfer photos and videos to the map, open Explorer, select files in the phone memory, click “Move” and select the path to the map. SD-map (usually) /storage/sdcard1). After transfer, make sure that files are opened from a new location before deleting the originals.
| Type of data | Recommended storage location | Risk of loss |
|---|---|---|
| Photos and videos | SD-map | Low (backup) |
| Documents | Internal memory. | Medium. |
| Cash app. | Internal memory. | Low (restored) |
| Offline maps | SD-map (in card settings) | Low. |
In the camera settings, be sure to change the default save path. Go to the camera settings → Additionally. → Retention on SD-Now, all new images will automatically be taken to the external medium without taking up precious interior space, which is especially true for high-resolution video.
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Internal memory is much faster than a microSD card, so it is better to leave systems and heavy games on the phone, and transfer photos and music to the map.
Remember that memory cards have a limited overwriting resource and can fail faster than a phone's embedded chip. Don't store a single copy of unique documents or family archives on them without backing up to the cloud or PC.
Removing system debris and MIUI folder
Shell MIUI And it creates a lot of service folders that eventually grow into tails. MIUI The root of the internal memory contains logs, error reports, and temporary theme files. debug_log, It can weigh a few gigabytes, and you can remove the contents of it if you're not a firmware developer.
Also worth a look at the Android → data folder. This is where app data is stored. Be careful: removing folders from games or programs will lead to loss of progress or settings. However, folders with the names of remote applications or the cache of streaming services (for example, Spotify or Netflix) can be cleaned if you want to reset them or free up space.
⚠️ Note: When manually cleaning through a file manager, never delete.apk files from system folders unless you are sure of their origin, and do not touch the folder. Android/obb without understanding what the content is responsible for.
Another source of hidden debris is the Download folder, where browsers and instant messengers often store all downloaded files. Check its contents: old app installers, PDF-files and chat pictures often lie there for years, so sorting by date will help you quickly find and remove unnecessary items.
Hidden folder.Trash.
For advanced users, there is a possibility of cleaning through Recovery mode, but this requires caution. Standard cleaning through the phone menu is 99% of the time sufficient. If the system says that the memory is busy and the files are not, you may need to reset, but this is an extreme measure.
Prevention and automation of cleaning
To avoid going back to cleaning up your memory every week, set up automation. The Security app has a Planner feature. Activate automatic garbage cleanup and virus checks on a schedule, such as every three days at 3 a.m. when your phone is not in use.
It's also useful to disable auto-save in instant messengers. WhatsApp and Telegram can prevent you from automatically uploading media to the gallery, then videos and photos will be available inside the chat, but will not be copied to the system folder of images, taking up double space. This is done in Settings → Chats → Save in the gallery.
Check the installed list regularly. Remove those that haven't been used for more than a month. Often we install one-time programs and forget about them, and they continue to hang in the background and consume resources. MIUI has a Cleanup feature in the application menu that tells you which ones haven't been launched in a long time.
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Once a month, restart your phone in safe mode to check if there is a virus miner or advertising module hidden in the system, which quietly fills the memory with logs.
Digital hygiene extends the life of a smartphone. The Redmi Note 9 Pro is a powerful device, but even it needs free space for temporary operations and swaps. The empty drive is faster and more stable.