Xiaomi and Redmi smartphone owners often face a lack of built-in storage, especially on low-end and mid-range models. Constant notifications of internal memory overflows prevent new applications from being installed, photos downloaded and system updates. The solution lies in the competent use of a microSD memory card, which can significantly expand the available space.
However, simply inserting a drive is not enough, as Android does not allow it to be fully used as part of system memory by default. In this article, we will discuss all available methods for integrating an external drive into the MIUI file system. You will learn how to migrate already installed applications, set up automatic data storage and what limitations this technology has.
It's important to understand that the effectiveness of this method depends on the version of the operating system and the specific model of your device. Some software manufacturers restrict access to deep file system settings. However, there are a number of proven ways to bypass standard restrictions and make the phone work with the memory card as the main one.
Preparation of memory card and compatibility check
The first step before any memory expansion procedure is to choose and prepare the right drive. Not all memory cards are equally productive, and using a slow drive can lead to braking the entire smartphone interface. For comfortable work, it is recommended to use UHS-I or UHS-II cards with a speed class of at least 10.
Before installing the card in the phone slot, make sure to check the card for errors. This can be done by inserting it into your computer and running the standard Windows Disk Checker utility or macOS analog. If the file system is damaged, the phone may not identify the drive or refuse to format it. Also make sure that the card size is supported by your phone model - older devices may not see drives larger than 128 GB.
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Use memory cards only from proven brands like SanDisk, Samsung or Kingston. Cheap counterparts often have understated real capacity and quickly fail when actively writing data.
After physically installing the card in the tray SIM-At this point, don't rush to choose the "Use as internal memory" option if it appears immediately. First, you need to do basic formatting so that the phone creates the correct folder structure for media files.
Adoptable Storage is set up via the Engineering Menu
A feature that allows you to combine internal memory and card into a single unit is called Adoptable Storage. In standard MIUI settings, this option is often hidden, but it can be activated through special commands or engineering menus, which is the most effective way, since it allows you to install applications directly to the memory card.
To activate the feature, you often need access to hidden developer settings. Go to Settings → About the phone and click on the MIUI build number several times until the developer mode notification appears. Then, in the advanced settings, find the option responsible for for forcing permission to write to the external drive.
⚠️ Note: Forced activation of Adoptable Storage on some Xiaomi models can lead to system instability or data loss if a crash occurs. Make sure that the memory card has a high write speed before making it system-wide.
If standard methods do not work, you can use them. ADB-This method requires you to connect your smartphone to your PC in debugging mode. USB. The sm partition command allows you to re-mark the card, turning it into a system partition, but after this procedure, the card will be encrypted and can not be read on other devices without re-formatting.
☑️ Check before activating Adoptable Storage
Transfer of installed applications to SD-map
Once the storage is successfully set up, it becomes a question of migrating the already installed programs, not all applications support moving, as developers can prohibit this in the program manifest, but a significant part of the software can be moved manually through the standard Android interface.
To do this, go to the Settings. → Annexes → All applications. Select the program you want from the list and find Memory. If you click Modify or Move to SD-The map is active, you can safely port the application. During the transfer, the application icon may temporarily disappear from the desktop - this is normal.
For mass application management, you can use third-party utilities such as App2SD or Files by Google, which allow you to quickly sort applications at the installation site and move them in batches. However, it is worth remembering that Xiaomi and Google Services system applications cannot be ported categorically, this will lead to errors in the phone.
- 📱 Open the settings of a particular application and check the availability of the move button.
- 💾 First of all, you can carry heavy games and social networks that take up a lot of space.
- ⚙️ Do not touch the system processes and widgets of the desktop.
- 🔄 After the transfer, restart the device to display the changes correctly.
Automatic saving of photos and videos on the map
One of the main reasons for memory overflow is multimedia content. The camera on modern smartphones shoots in high resolution, and the weight of one minute of video can reach hundreds of megabytes. Fortunately, the standard application “Camera” in the shell of MIUI allows you to change the default saving path.
Open the camera app, click on the three bars in the upper right corner and select Settings. In the list of options, find Save to SD-Then, all new images and videos will automatically be saved to an external drive, bypassing the internal storage.
You need to do the same thing in messengers if you're actively using them. On Telegram, for example, you can specify the path to the cache in the data and memory settings. On WhatsApp, you can also change the way you save media files in the chat section, which will free up gigabytes of space that usually takes up sent pictures and voice messages.
Comparison of methods of memory expansion
There are several approaches to using a memory card, and each has its advantages and disadvantages, and the choice of method depends on your goals: whether you want to install games on a map or just store an archive of photos there. Below is a table comparing the main methods.
| Method | Speed of operation | Installation of applications | Risks. |
|---|---|---|---|
| Standard storage | Tall. | Impossible. | Minimum |
| Adoptable Storage | Medium/Low | Maybe. | Data loss when card failure |
| Manual transfer | Depends on the app. | Partially. | Launch errors |
| Symbolic references | Tall. | Demands a Root. | High (for beginners) |
As you can see from the table, Adoptable Storage is the most versatile method, but it imposes card speed requirements. If you choose this method, make sure you use a drive with a high rewrite life. Cheap cards can quickly exhaust their write cycle limit when you actively work with applications.
What are Symlink (Symlink) links?
Optimization of the system with external memory
Once you have set up a memory card, it is important to monitor its condition. The file system on external drives is prone to fragmentation, which over time reduces the speed of reading and writing. Periodically, about once every six months, it is recommended to check the card for errors and if necessary, defragment (via PC).
If the phone is reporting a slow drive, it’s best not to ignore this warning. In some cases, it makes sense to format the card again by selecting the ext4 file system (if there’s Root) or leaving FAT32/exFAT for maximum compatibility.
⚠️ Warning: Never remove the memory card hot while the application is being written or ported, guaranteed to damage the file system and lose some data.
To extend the card's life, you can limit the background recording. Some applications have an SD caching setting, and turning it off will cause the application to use internal memory for temporary files, which may be faster, but it will take up the main storage space.
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Regular backup of data from SD-Cards to your computer or the cloud are the only guarantee of your information security, since external drives are less reliable than the built-in memory of the phone.
Possible problems and solutions
Users may encounter a number of common problems during the setup process, such as the phone may stop seeing the card after the system update, in which case try to remove the drive, wipe the contacts, and paste again. If that doesn't work, check the card on another device.
Another common problem is that apps that are transferred to the map stop working or crash, which happens if the card read speed is not enough for the specific software to work, in which case the application will have to be returned to internal memory or deleted, and there may be problems with the widgets of the ported applications - they can disappear from the desktop.
If you notice that the phone started to run slower after the card was introduced into the system, try to reduce the load on the drive. Turn off the indexing of media files for the gallery or move back the heaviest and most commonly used applications. The internal memory of eMMC or UFS in the phone is usually faster than most microSD cards.