Owners of Xiaomi Redmi 9 often face limited built-in storage, especially in basic device configurations. Overflowing memory leads to slowdowns, inability to install updates and heavy applications. Using an external microSD card becomes the only effective way to expand the gadget’s capabilities without buying a new device.
But the standard MIUI shell has its own external media features that are different from pure Android. Direct transfer of these programs to the USB drive is often hidden from the user or requires the activation of special developer functions. Understanding these nuances will allow you to free up precious gigabytes and speed up the interface.
In this article, we will discuss all available methods of memory expansion, from standard settings to using the engineering menu, you will learn how to properly prepare the drive and what risks exist when changing system parameters.
Preparation of memory card and smartphone for work
Before starting any manipulations, you need to make sure that your memory card meets the requirements of the system. For comfortable operation of modern applications, it is recommended to use cards of the UHS-I speed class or higher with a volume of at least 32 GB. Slow drives can cause lags even in simple programs, turning a smartphone into an unusable device.
Insert the card in the appropriate slot located in the end of the body next to the tray for SIM-The system must automatically identify the new media and offer formatting. If the notification does not appear, manually navigate to the settings via the Settings path. → The phone. → Warehouse.
⚠️ Note: Formatting a memory card completely deletes all the data stored on it. Be sure to back up photos and documents to your computer before starting the procedure.
Select the option “Use as portable storage” to maintain compatibility with other devices or “Use as internal storage” to integrate into the system. The second option requires a more powerful memory card, as it will work in constant read-write mode by system processes.
☑️ Preparation for memory expansion
Standard method of transfer through MIUI settings
In most cases, the MIUI shell does not allow you to transfer the application executables themselves to an external medium without root permissions. However, you can move the cache, media files and some data. To do this, open the settings and find the Application → All Applications section.
Select the desired program from the list, for example, a social network or messenger. If the developer has provided such a possibility, the button "Move to the mobile app". SD-The card will be active, otherwise the system will only prompt you to clear the data or delete the application.
Often users see the gray color of the move button, which means that the application architecture does not support data separation or the developer has banned installation outside of internal memory, in such cases, standard methods will not work.
- 📱 Go to the application management menu and select a heavy program.
- 💾 Click on the “Memory” or “Storage” button inside the app card.
- 🔄 If the button is active, select “Change” and specify SD-map.
- ⏳ Wait for the data copying process to be completed without turning off the screen.
It is worth noting that even after the transfer, some of the system files will remain in internal storage, which is a prerequisite for the security and stability of the Android operating system.
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Some Xiaomi system applications, such as Gallery or Explorer, may not have a port button.This is normal and is not a system error.
Activate Adoptable Storage through ADB
To fully use the memory card as part of internal storage on Xiaomi Redmi 9 often requires activation of the hidden function Adoptable Storage. SD-card extension of the built-in memory, which makes it possible to install any applications there.
To implement this method, you will need a computer, USB-cable and on-line debugging USB Find the About phone in the settings and press 7 times on the build number. MIUI, activate the developer menu.
adb shell pm set-install-location 2Once you have a command, the system will try to redirect the installation of new apps to an external medium, but this method does not always work consistently on new versions of Android and can lead to the fact that the applications will stop updating through Google Play.
⚠️ Attention: Use of teams ADB Be careful and back up important data before making changes to system settings.
An alternative to the adb shell sm set-force-adoptable true command may be more efficient, but requires pre-formatting the card via a computer, a method that is considered more reliable for older devices with less memory.
Use of engineering menus and third-party utilities
There are specialized applications, such as App2SD or Files2SD, that attempt to automate the transfer process. They work by creating character links or using file system access rights.
Without root rights, these programs are limited in functionality, they can only move data that the operating system itself is allowed to move, and full-time work requires superuser rights, which is a complex and risky procedure.
| Method | Difficulty | Efficiency | Risks. |
|---|---|---|---|
| Staff transfer | Low. | Low. | Absent. |
| ADB teams | Medium | Medium | Average. |
| Root rights | Tall. | Tall. | Tall. |
| Third-party launchers | Low. | Low. | Absent. |
Some users have resorted to customized recaps (TWRPs) to force partitioning, which allows for technically melding partitions, but requires a deep knowledge of the firmware of Xiaomi devices.
What are Root Rights and Are They Needed?
Optimizing the operation of applications after the transfer
After moving data to a memory card, it is important to monitor performance.The read speed of random blocks in microSD cards is usually lower than that of embedded eMMC or UFS flash memory. This can lead to longer loads of heavy games.
It is recommended to defragment the file system of the card regularly if this is possible with file managers, and avoid filling an external drive by more than 85%, as this critically reduces the write speed.
- 🗑️ Regularly clean the cache of transferred applications through settings.
- 📸 Set the camera so that the photos and videos are immediately saved to the camera. SD.
- 🎵 Music and video files are better kept separate from system data.
- 🔄 Periodically check the status of the card for errors.
If you notice that your smartphone has started to run slower after porting apps, try returning the heaviest programs to internal memory.Data distribution balance is key to a stable Redmi 9.
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The most important applications (messaging apps, banking clients) are best left in internal memory for maximum response speed and security.
Possible problems and ways to solve them
One of the common problems is that the widgets of the ported applications disappear after the device is restarted, which happens when the system does not have time to mount the external drive before the interface loads, and the solution can be to use cards with a high response rate.
There is also an “Application not installed” error when trying to download new programs, in which case you should check whether the partition of internal memory reserved for system files is full, even if the bulk of the data is on the SD.
⚠️ Warning: If the memory card suddenly stops being defined, don't rush to format it again. Try to retrieve and paste back or check the contacts in the slot. Frequent formatting wears out the storage life.
In rare cases, after updating the MIUI firmware, storage settings may reset. You will have to re-activate the memory card use through the settings menu. Save the originals of important files in the cloud to avoid losing them when crashes.