Owners of the popular Xiaomi Redmi 9 often face a lack of free space in the process of using a smartphone. Built-in storage of 32 or 64 gigabytes is quickly filled with system files, social network cache and heavy games, which leads to slowdown of the interface and the inability to install new programs.
However, the standard file transfer procedure does not always free up space for applications, since the Android operating system stores programs in the internal partition by default. Full transfer requires activation of a special feature known as Adoptable Storage, or the use of alternative methods available on the MIUI shell. In this article, we will discuss in detail all ways to expand the useful space.
Properly configured memory cards will turn it into a full-fledged extension of the system disk, allowing you to install games and software directly on the external media, not only frees up precious megabytes, but also extend the life of the built-in flash memory of the device, reducing the load on it during frequent recording operations.
Preparation of memory card and smartphone for work
Before you start any manipulation of the file system, you need to make sure that the storage device used is compatible and serviceable. For Redmi 9, it is recommended to use Class 10 or higher cards, since the read and write speed directly affects the speed of the applications installed on them. Slow cards can cause friezes and long downloads of programs.
Insert the memory card into the appropriate slot of the hybrid tray, making sure that it is securely fixed. Once the smartphone is turned on, the system will automatically prompt you to format the new media. At this stage, it is important to choose the right type of formatting to get the desired result.
There are two main ways to use an external drive in an Android environment:
- 📁 Portable storage – the card is used only for media files (photos, videos, music), access to them is possible from other devices without re-formatting.
- 📱 Internal storage – the card is encrypted and becomes part of the system partition, allowing you to install applications on it, but you lose the ability to read on other gadgets without resetting.
For our goal of porting software, we need to aim for the second option, although the standard MIUI menu often hides this possibility by offering only portable use. Below we will look at how to circumvent this limitation.
Activate Adoptable Storage through ADB
Since Xiaomi often hides the native memory merge feature in the MIUI shell, it will require the use of an ADB (Android Debug Bridge) debugging bridge to activate it, which is safe if you follow the instructions and does not require obtaining superuser rights (Root), which preserves the warranty on the device.
To get started, you need to activate the developer mode on your Redmi 9. Go to the settings, find the "About Phone" item and quickly click on the MIUI build number seven times. After the notification of successful activation appears, a new "Developers" section will appear in the menu.
Turn on the USB Debugging option in the menu that opens. Then connect your smartphone to your computer using a high-quality cable. The phone will have a request for debugging permission on its screen — be sure to tick the Always Allow box and confirm the action.
⚠️ Note: Before executing commands through ADB While the risk is minimal, any manipulation of memory partitions could theoretically lead to loss of information if the process is interrupted.
Once connected, open the command line on your computer in the ADB tool folder and enter the command to check the connection: adb devices. If the device is determined, you can proceed to directly activate the port function.
Step-by-step instructions for data transfer
After successfully activating hidden functions or having a standard portability in your firmware version, the data process is as follows: First, the system should format the card as internal memory.
☑️ Checklist before transfer
Go to the Settings menu → Memory. Select your memory card and click "Format." If you used it. ADB-sm set-force-adoptable true, the menu will have a selection of the correct one, and after formatting, the system will prompt you to move the data.
Then we go to customize each application. Go to Settings → Applications → All applications. Select the desired program (for example, a game or a social network). If the application supports portability, you will see a "Move" or "Change" button in the storage section.
Not all programs support this function, and developers decide whether their software can run on an external drive, but system applications and many popular games allow you to transfer your weight to the main drive. SD-map.
Why can't some apps be moved?
Comparison of data storage methods on Redmi 9
Understanding the difference between memory types will help you distribute files correctly. The internal memory of eMMC or UFS used in Redmi 9 has a high random access speed, which is critical for running "heavy" applications.
External microSD cards, even high-speed ones, are usually inferior to the internal module in the speed of writing small files, so it makes sense to transfer only bulk data, not the system cache.
| Parameter | Internal memory. | SD card (Portative) | SD card (Internal) |
|---|---|---|---|
| Speed of operation | Tall. | Medium/Low | Depends on the class of the card. |
| Installation of applications | Automatically. | Impossible. | Maybe. |
| Reading on PC | Cable required | Through the adapter | Only after discharge. |
| Reliability | Tall. | Medium | Medium |
Using an Adoptable Storage card encrypts data by linking it to a particular instance of a smartphone, which increases security, but renders the card useless without a phone if it breaks.
Optimization of camera and messengers
Special attention should be paid to reconfiguring the storage paths for multimedia: Xiaomi’s camera defaults to writing photos and videos into internal memory, quickly filling it up, and you can change this in the settings of the camera app itself.
Open the camera, click on the three menu bars in the top corner and select settings. Find the "Save on" item. SD-Now all new images and videos will automatically be saved to an external drive.
For instant messengers like Telegram or WhatsApp, the setup is done inside the apps themselves. In Telegram, the path changes under Settings → Data and Memory → Path to Files. WhatsApp can specify a new directory when you first install or through chat settings.
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Use the file manager to manually sort. DCIM and Pictures folders can be moved to a map, and in the system settings specify new paths if your version of MIUI allows you to change the system links to folders.
Regularly cleaning the messenger cache also helps to save space. In the application settings, find the item "Memory Use" and clear the cache if it has grown to several gigabytes.
Possible problems and solutions
During operation, there may be situations when the smartphone stops seeing the card or applications begin to work unstable, most often due to poor quality of the drive itself or damage to the file system.
If you see persistent memory card error notifications, try removing it, erasing the contacts, and pasting it again. If the problem persists, check the card on your computer using the SD Formatter or H2testw utility to identify broken sectors.
⚠️ Attention: Cheap memory cards from marketplaces often have a real volume significantly less than stated. Using such drives as internal storage will lead to data loss and cyclical reboots of Redmi 9.
Another common problem is that the interface is slow after a large number of applications are transferred, which indicates a low speed of random reading of the map, in which case it is advisable to return the applications to internal memory, leaving only photos and videos on the map.
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The stability of your smartphone depends on the quality of the memory card. Don't skimp on the drive if you plan to use it to install programs.