Smartphone owners Xiaomi Redmi 9 often face a situation where the internal storage of the device is rapidly filling up. Modern applications and games consume gigabytes of free space, and smartphones are limited to 32, 64 or 128 gigabytes. When the system begins to signal a lack of resources, performance drops and installation of new software becomes impossible. In such a situation, the logical solution seems to be to use an external drive to unload the system. built-in memory smartphone is limited to 32, 64 or 128 gigabytes. When the system begins to signal a lack of resources, performance drops and installation of new software becomes impossible. In such a situation, the logical solution seems to be to use an external drive to offload the system.
However, the process of transferring data on devices with a shell MIUI has its own unique features and limitations, which differ from the “clean” one. Android. Many users mistakenly believe that they just need to insert a USB flash drive and all apps will automatically move there. In fact, Google's security policy and specific settings manufacturer often block the direct transfer of application executable files to external media. However, there are working optimization methods that allow you to effectively use the card microSD for storing media files and app cache.
In this guide we will analyze in detail all the available methods for managing memory on your gadget. You'll learn what types of data can be moved without risk of loss of functionality, how to set up a camera to save photos to a card, and what hidden developer features can help solve the problem of running out of space. Understanding the file system architecture Android 10 or Android 11on which your phone is based will help you avoid fatal errors when manipulating data.
Preparing a memory card and checking compatibility
Before proceeding with any settings, you need to make sure that your external drive meets the technical requirements devices. Xiaomi Redmi 9 supports cards of format microSDHC i microSDXC with a capacity of up to 512 GB. Using low-quality or counterfeit flash memory can result in data loss, system freezes, and even damage to the expansion slot. Always purchase media from trusted suppliers and pay attention to the write speed class.
For comfortable operation of applications, even if they are not installed directly on the card, data read speed plays a critical role. If you plan to store heavy files on the drive or use it as an extension of internal memory (through third-party utilities), the minimum requirement is speed class Class 10 or standard UHS-I. Slow cards can cause lags when launching apps and slowdown of the interface when viewing the gallery.
⚠️ Attention: Formatting a memory card deletes all data stored on it. Be sure to back up important photos and documents to your computer or cloud storage before starting setup.
After physically installing the card in the tray (combined with the slot for the second SIM card), the system should automatically detect the new device. A corresponding message will appear in the notification panel. If this does not happen, check that the chip is installed correctly with the contacts facing down. In rare cases, a device reboot is required to initialize the hardware.
Use a memory card adapter when connected to a PC to quickly copy large amounts of data without wasting traffic and time on cable transfer.
Standard MIUI capabilities for working with external storage
Shell MIUIinstalled on Xiaomi Redmi 9, provides the user with a basic set of tools for managing files. Unlike older versions of Android, there is no direct "Move to SD card" button in the settings of each application. This is done to ensure system stability, since external media is less reliable than built-in flash memory. However, you can flexibly configure saving paths for most system modules.
The first step in optimization is to change the camera settings. By default, all pictures and videos are saved to the internal memory, quickly filling it up. To fix this, open the Camera app, tap the menu icon in the top right corner, and select Settings. Find the switch Save to SD card and activate it. Now all media content will be automatically written to external storage.
- 📸 Camera settings allow you to instantly switch saving photos and videos to an external drive.
- 🎵 In the Music and Voice Recorder application, you can manually select the destination folder in the settings records.
- 📂 The Explorer file manager sees the memory card as a separate volume for manually moving documents.
It is also worth checking your browser and instant messenger settings. In a popular browser Chrome or MIUI Browser in the downloads section, you can specify the path to save files. The same applies to Telegram i WhatsApp: in the data storage settings of these applications, you can change the directory for downloading media files. This frees up a significant amount of internal space without the need to transfer the apps themselves.
Why the application transfer button is often inactive
Many users, when entering the menu Settings → Applications → All applications, are disappointed to find that the button to move to the memory card is inactive (grayed out) or not at all missing. This is not a malfunction of your specific instance Xiaomi Redmi 9. This behavior was incorporated by the developers of the operating system Android starting with version 6.0 and tightened in newer releases.
The main reason for the restrictions lies in the security architecture. Application developers themselves decide where their product can be installed. If the app manifest does not include support for external storage (android:installLocation), the system blocks the transfer. In addition, widgets, live wallpapers and system services cannot function correctly if their files are located on removable media that the user can remove at any time.
There is a misconception that moving the entire application will speed up its operation. In practice, the opposite effect is often observed. The speed of reading random blocks of data on a memory card, even a high-end one, is usually lower than that of built-in storage type eMMC 5.1 or UFS. This can lead to increased loading times for apps and the appearance of freezes in games.
⚠️ Attention: Forced transfer of system applications through the engineering menu can lead to unstable operation of the phone, endless loading (bootloop) or complete failure of some interface functions.
However, some user apps support the transfer. These are usually old or simple utilities that do not require high speed file access. If the button is active, you can safely move such applications, but monitor their behavior after migration.
Technical details of the restriction
Starting with Android 6.0, Google introduced a runtime permissions model that made it more difficult for apps to run from external storage. When removing the card, the system cannot guarantee the integrity of the application data, so it prefers to keep the code in the internal memory.
Instructions for transferring supported applications
If you find a app that officially supports the move, the procedure is quite simple through the standard settings menu. No need to connect your phone to your computer or use complex commands. It is enough to follow the algorithm, which is the same for most firmware versions installed on Redmi 9. MIUI 12 And MIUI 13installed on Redmi 9.
First, make sure that the memory card is formatted and is recognized by the system as portable storage. Then open your smartphone settings and go to the application management section. Here is a complete list of installed software, including system components and user downloads.
☑️ Transfer algorithm
In the list, find the application you are interested in and tap on it. In the menu that opens, select Storage. If transfer is possible, you will see a button Edit or Move to SD card. Click it and confirm the action. The process may take from a few seconds to several minutes depending on the size of the application and the speed of the card.
| Application type | Capability transfer | Recommendation |
|---|---|---|
| Games with cache | Partially (APK only) | Transfer cache manually through Explorer |
| Social networks | Forbidden | Clear cache inside the application |
| Office apps | Often available | Can be moved completely |
| System utilities | Prohibited | Do not touch to avoid failures |
After the operation is completed, the application icon on the desktop may momentarily disappear and reappear. This is normal system behavior when updating paths to executable files. If the app stops starting, return it back to the internal memory through the same settings menu.
Using developer mode to force a transfer
For advanced users for whom standard methods are not enough, it is possible to activate hidden Android functions. There is an option in the developer menu that allows you to force installation and transfer of applications to external drives, even if the software developer has prohibited this. However, using this method is associated with certain risks.
To activate developer mode, go to Settings → About phone and find the item MIUI version. Quickly click on it 7-10 times in a row until a notification appears indicating that you have become a developer. After this, a new section will appear in the main settings menu Advanced → For developers.
Inside this section, scroll down the list to the “Applications” item. Find the option Allow saving to external drives (or “Force allow apps on external”). Activate this switch. After enabling this function, restart your smartphone for the changes to take effect.
⚠️ Attention: Forced transfer may disrupt the operation of widgets and notifications. Apps moved this way may not be updated automatically through Google Play.
After reboot, check the list of applications again. Now the move button can become active for those apps that were previously blocked. Use this feature with caution, testing the stability of each moved app. If you notice any glitches, undo the changes immediately.
Developer mode is a powerful tool, but it does not guarantee compatibility of all applications with external media, since restrictions may be at the code level of the app itself.
Alternative methods for freeing up internal memory
If transferring the applications themselves is impossible or impractical, you should focus on transferring their data. Most modern software stores the bulk of information (cache, downloaded files, databases) in separate folders that can be moved manually. This has almost the same effect of freeing up space as transferring an APK file.
Use the built-in file manager MIUI or a third-party explorer, for example Total Commander or FX File Explorer. Find folders Android/obb and Android/data in the internal memory. Cache files of games and heavy applications are stored here. You can cut these folders (or their contents for specific games) and paste them into similar directories on the memory card.
- 🎮 For games, move folders with long names (for example, com.gameloft.android) from
Internal Storage/Android/obbto the card. - 📷 For instant messengers, move folders
Telegram,WhatsApp,Viberfrom the root of the internal memory to external media. - 🗑️ Regularly use the built-in Cleanup utility to remove temporary files and remnants of deleted apps.
It is important to understand the path structure. After transfer, the folder structure on the memory card should completely match the original one. For example, if you are transferring a game cache, a path SD Card/Android/obb/com.name.gamemust be created on the map. If the structure is broken, the application will not see its data and will require re-downloading resources.
Another effective method is to use the Smart Boot feature in some launchers or display settings, which allows you to store thumbnails and interface cache on external media. Although this does not provide a radical increase in free space, every megabyte is important when the storage is full.
Frequently asked questions and problem solving (FAQ)
Why does the game require you to download the cache again after transferring?
This happens if you moved only the APK file of the application, leaving the folder with the cache (obb) in internal memory, or vice versa. When starting, the game checks the integrity of the paths. Solution: manually move the cache folder through the file manager to the corresponding directory on the memory card, observing the folder structure.
Is it possible to make a memory card the main memory on Redmi 9?
Officially the shell MIUI does not support the function Adoptable Storage (memory merging), which was in pure Android. This can only be done via ADB commands from a computer, but this requires skills and may void the warranty or lead to data loss when resetting the settings.
The phone stopped seeing the card after transferring applications, what should I do?
Try reboot the device. If that doesn't work, remove the card and reinsert it. Check the contacts on the card chip - they may have oxidized. As a last resort, copy the data to a PC, format the card in FAT32 or exFAT format and try transferring the files again.
Does transferring applications affect the speed of the smartphone?
Yes, it can. If the memory card has a low write speed (below Class 10), applications will take longer to load, and games may experience stuttering. For system applications and frequently used apps, it is recommended to leave them in the internal memory.
How to return an application back to the internal memory?
The procedure is similar to transferring it to a card. Log in Settings → Applications, select the desired app, go to section Storage and press the button Move to internal memory. The system will automatically restore the paths to the files.