Smartphones line Xiaomi Redmi 9 remain a popular choice among users who appreciate the balance between price and functionality, however, built-in drive capacity of 32 or 64 GB is often not enough to install all the necessary programs and games. Modern multimedia applications take up gigabytes of space, and the cache of social networks and messengers is able to "eat" all free memory in a matter of months of active use of the device.
Fortunately, the Redmi 9 model is equipped with a hybrid slot that allows you to install a microSD card up to 512 GB. This solution opens up the possibility for the user not only to store photos and video files, but also to transfer some of the heavy programs to an external medium. This process has its own technical nuances in the shell. MIUI, which are important to know to avoid data loss or system instability.
In this guide, we will take a look at all the available ways to optimize disk space, including standard portability methods and advanced techniques such as formatting a card for internal memory. You will learn which programs are migratable and which are systemically forbidden to move by Android developers. Proper file system management will significantly extend the comfortable life of your smartphone without having to buy a new model.
Preparation of memory card and smartphone for work
Before you start manipulating the file system, you need to make sure that the memory card is physically healthy and that it is correctly installed. The microSD card must be inserted into the appropriate slot on the end of the device, next to the tray for the device. SIM-To remove the tray, you need a special clip that comes with the kit, or a thin needle. It is important to insert the carrier before the characteristic click, making sure that the contacts are directed correctly.
Once installed, Android will automatically detect the new drive and prompt it to be configured, and a notification will appear on the screen that goes to the use menu, and here lies the key point: by default, the system will suggest using the card as "Portable Storage." This is the standard mode in which the card stores media files, but the applications are installed in the internal memory of the phone.
For our application porting purposes, we'll need to change the logic of the drive, but before that, we recommend checking the speed of the card writing. Slow C6 or C10 cards can significantly slow down your smartphone if you move active applications to them. Use benchmarks or built-in diagnostics to make sure your drive copes with the load.
☑️ Pre-transfer check
If the card was previously used on another device, it may still have files with erroneous access rights or damaged structure, in which case the system may suggest formatting. Formatting the card into internal memory will completely delete all data from it, so be sure to back up important documents and photos to your computer or cloud storage before starting the procedure.
Standard method of transferring applications through settings
The Android operating system running Redmi 9 has a regular application management mechanism that allows you to move some programs to an external medium, which is the most secure and does not require extended access rights (root). To use it, open the Settings menu and find the Application section, then select All applications.
In the list that opens, find the program you want to move. Unfortunately, not all applications support this function. If the developer does not provide portability, the change of storage button will be missing or inactive. For those programs where transfer is possible, you will see the Change button or the Warehouse with the option to select the installation location.
When selecting a memory card, the system will start the file copying process, depending on the size of the application and the speed of writing your microSD, during which time it is not recommended to turn off the screen or start other heavy tasks so as not to interrupt the writing process, which can damage the application data.
It is worth noting that even after transferring some of the application files (so-called "Space") OBB-Files or cache data can remain in internal memory. This is the normal behavior of Android security, which ensures that critical components of the program are not lost when the card is retrieved. Completely free internal storage in this way is rarely possible, but a few hundred megabytes to win quite realistically.
Use of the card as internal memory (Adoptable Storage)
There is a more radical, but more effective way to address the space gap, the Adoptable Storage feature, which allows you to format your memory card in a way that Android perceives as an extension of the built-in drive, in which case you can install any application on the map, even those that cannot be transferred by standard methods.
To activate this feature on Xiaomi Redmi 9 with a MIUI shell, you often need to use hidden commands or third-party gates, since the manufacturer hides this option by default. However, if the map settings menu offers a choice "Use as internal storage", feel free to choose this option.
⚠️ Note: After formatting the card for internal memory, it is strictly impossible to extract it without first unmounting in the settings. This will lead to a malfunction of applications whose data is on the media, and possible loss of information.
The formatting process can take anywhere from 5 to 15 minutes depending on the card size, during which time the phone can heat up - this is the normal reaction of the processor to active recording operations. Do not interrupt the process and keep the device connected to the charger to avoid battery drain at a critical moment.
What if the “Inner Memory” option does not appear?
Once the formatting is successfully completed, the system will suggest migrating the already installed applications, you can agree to an automatic transfer or do it selectively later, and the advantage of the method is that new applications will be installed on the map by default, if the amount of internal memory is not critically small.
Working with multimedia files and messenger cache
Often, the majority of memory on Redmi 9 is not occupied by the applications themselves, but by their content: photos, videos, voice messages and downloaded files in instant messengers. The transfer of the applications themselves gives only a temporary effect if you do not set up a system for storing media files.
Open the Camera app, click on the menu (three bars in the corner) and go to the settings. SD-From now on, all new images and videos will be automatically saved to an external drive, bypassing internal memory, which frees up a lot of space, as modern cameras shoot in high resolution.
| Type of data | Where do they take up space? | Recommended action |
|---|---|---|
| Photos and videos | DCIM/Camera folder | Enable SD Saving in the Camera Settings |
| WhatsApp Media | Internal Memory / Android / Media | Set up WhatsApp: Data Storage -> Media Visibility |
| Telegram files | Internal memory / Android / Data | Change the save path in Telegram settings |
| Browser downloads | Download folder | In the browser settings, indicate the path to SD-map |
WhatsApp and Telegram messengers require special attention. They store all received images and videos in internal memory by default. Telegram settings can specify a path to save files by selecting a memory card. WhatsApp is more complicated: the application stores the database and media in internal memory, and you can not transfer them with regular means, but you can regularly clean the cache or use the function of archiving chats with subsequent deletion.
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Use Google’s Files app or Xiaomi’s built-in Explorer to manually move music and document folders to the root. SD-This will free up space in the internal storage, which is often filled with junk files.
System limitations and possible problems
Despite all the benefits of using external memory, users of Xiaomi Redmi 9 may face a number of restrictions imposed by the Android operating system.Since version 6.0, Google’s security policy has become stricter regarding the rights of applications to external drives.
Many modern applications, especially banking, system utilities and programs tied to widgets and live wallpaper, simply do not have a flag to allow them to move. The list of applications will be missing a transfer button. Attempts to circumvent this restriction without root rights are usually unsuccessful and can lead to unstable software.
⚠️ Note: If the application stops running or is running with errors after transfer, return it to internal memory. SD-The card, especially if the card has a low reading speed.
Another problem is speed, even fast memory cards are inferior in read/write speed to the built-in flash memory of a smartphone. Transferring heavy games with heavy graphics to the map can lead to increased load times and "freezes" during the game.
Also, the physical wear and tear of memory cards is important, because they have a limited resource of overwriting cycles, and when you have applications that are constantly writing logs and cache, the card can fail faster than the phone's internal memory, and you can back up important data stored on external media regularly.
Alternative ways to free up space
If you can't port applications or you don't get the desired results, you should turn to other optimization methods, first of all, cleaning the cache. Go to Settings -> Memory and use the built-in cleaning utility. It will find temporary files, remnants of remote programs and advertising debris.
The second efficient method is to use cloud storage: services like Google Photos, Yandex.Disk or Mi Cloud allow you to store photos and videos online, removing local copies of them from your phone. Enable the "Free space" function in Google Photos to automatically delete from the device pictures that are already uploaded to the cloud.
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A comprehensive approach to memory cleaning (cache removal, media transfer, cloud technology) is often more effective than trying to transfer system applications to a memory card.
The third option is to use the “light” versions of applications. For popular social networks, there are versions of Lite (for example, Facebook Lite, Messenger Lite, Google Go), they take up much less space, consume less traffic and RAM, while retaining basic functionality. For a budget smartphone Redmi 9 can be a great solution to the problem of lack of resources.